Examples with solutions for Graphical Representation: Determining the slope of a function with a point

Exercise #1

A straight line with a slope of 2y passes through the point (3,7) (3,7) .

Which equation corresponds to the line?

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Write the equation using point-slope form
  • Step 2: Substitute the given point and slope into the equation
  • Step 3: Simplify to find the slope-intercept form of the line equation

Now, let's work through each step:

Step 1: Use the point-slope form of a line equation, given by yy1=m(xx1)y - y_1 = m(x - x_1), where (x1,y1)(x_1, y_1) is a point on the line.

Step 2: Given that the slope is represented as 2y2y and the line passes through point (3,7)(3, 7), we should interpret it as the slope being equivalent to 2 (as 2y2y in relation suggests y=2x+by=2x+b structure supposedly intended this way). This gives us a slope m=2m = 2.

Using point (3,7)(3, 7), we substitute into the formula:

y7=2(x3) y - 7 = 2(x - 3)

Step 3: Simplify the equation:

y7=2x6 y - 7 = 2x - 6

y=2x6+7 y = 2x - 6 + 7

y=2x+1 y = 2x + 1

Therefore, the equation of the line is y=2x+1 y = 2x + 1 .

Answer

y=2x+1 y=2x+1

Exercise #2

A straight line with the slope 9 passes through the point (5,8) (-5,-8) .

Which of the following equations corresponds to the line?

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the given information
  • Step 2: Apply the point-slope formula
  • Step 3: Convert to slope-intercept form and verify against the given choices

Now, let's work through each step:
Step 1: The problem states the line passes through point (5,8)(-5, -8) and has a slope of 99.
Step 2: Using the point-slope form equation, yy1=m(xx1)y-y_1 = m(x-x_1), plug in (x1,y1)=(5,8)(x_1, y_1) = (-5, -8) and m=9m = 9. So the equation becomes:

y(8)=9(x(5)) y - (-8) = 9(x - (-5))

Which simplifies to:

y+8=9(x+5) y + 8 = 9(x + 5)

Simplifying further gives:

y+8=9x+45 y + 8 = 9x + 45

Then, bring the 88 to the right side to solve for yy in terms of xx:

y=9x+458 y = 9x + 45 - 8 y=9x+37 y = 9x + 37

Therefore, the equation of the line in slope-intercept form is y=9x+37y = 9x + 37, which corresponds to choice 11.

Therefore, the solution to the problem is y=9x+37y = 9x + 37.

Answer

y=9x+37 y=9x+37

Exercise #3

Given the line parallel to the line y=4 y=4

and passes through the point (1,2) (1,2) .

Which of the algebraic representations is the corresponding one for the given line?

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the key characteristics of the line parallel to y=4 y = 4 .
  • Step 2: Use the point (1,2) (1,2) to determine the new horizontal line equation.
  • Step 3: Write the equation based on the consistent y-value of the line.

Now, let's work through each step:

Step 1: The given line y=4 y = 4 is a horizontal line. All horizontal lines have equations in the form y=c y = c , where c c is a constant value describing the uniform y-position of the line.

Step 2: A line parallel to y=4 y = 4 that also passes through the point (1,2) (1,2) would maintain a constant y-value. Since it must pass through (1,2) (1,2) , its y-intercept is y=2 y = 2 .

Step 3: Therefore, the equation of the line parallel to y=4 y = 4 through (1,2) (1,2) is simply y=2 y = 2 . This ensures it parallels the horizontal direction.

Thus, the algebraic representation of the line parallel to y=4 y=4 and passing through the point (1,2) (1,2) is y=2 y = 2 .

Answer

y=2 y=2

Exercise #4

Given the line parallel to the line y=3x+4 y=3x+4

and passes through the point (12,1) (\frac{1}{2},1) .

Which of the algebraic representations is the corresponding one for the given line?

Video Solution

Step-by-Step Solution

To solve this problem, we begin by noting that since the line is parallel to y=3x+4 y = 3x + 4 , it must have the same slope, m=3 m = 3 .

We use the point-slope form of the equation of a line, which is:

yy1=m(xx1) y - y_1 = m(x - x_1)

Here, the slope m=3 m = 3 and the line passes through the point (12,1) \left(\frac{1}{2}, 1\right) . Therefore, we substitute these values into the point-slope formula:

y1=3(x12) y - 1 = 3\left(x - \frac{1}{2}\right)

Next, we simplify this equation:

  • Distribute the slope 3 3 on the right side:
  • y1=3x32 y - 1 = 3x - \frac{3}{2}
  • Add 1 to both sides to solve for y y :
  • y=3x32+1 y = 3x - \frac{3}{2} + 1
  • Simplify 32+1-\frac{3}{2} + 1:
  • y=3x12 y = 3x - \frac{1}{2}

Thus, the equation of the line parallel to y=3x+4 y = 3x + 4 and passing through the point (12,1) \left(\frac{1}{2}, 1\right) is:

y=3x12 y = 3x - \frac{1}{2}

The corresponding choice is:

y=3x12 y=3x-\frac{1}{2}

Answer

y=3x12 y=3x-\frac{1}{2}

Exercise #5

Given the line parallel to the line y=2x+5 y=2x+5

and passes through the point (4,9) (4,9) .

Which of the algebraic representations is the corresponding one for the given line?

Video Solution

Step-by-Step Solution

To solve this problem, let's proceed through these steps:

  • Step 1: Identify the slope of the original line. From y=2x+5 y = 2x + 5 , the slope m m is 2 2 .
  • Step 2: Since parallel lines have the same slope, the line we're looking for will also have a slope of 2 2 .
  • Step 3: Use the point-slope formula with the given point (4,9) (4, 9) :

We begin with the point-slope formula:

yy1=m(xx1) y - y_1 = m(x - x_1)

Substitute m=2 m = 2 , x1=4 x_1 = 4 , and y1=9 y_1 = 9 into the equation:

y9=2(x4) y - 9 = 2(x - 4)

Simplify the equation:

y9=2x8 y - 9 = 2x - 8

Solving for y y , we obtain:

y=2x8+9 y = 2x - 8 + 9

y=2x+1 y = 2x + 1

Therefore, the algebraic representation of the line parallel to y=2x+5 y = 2x + 5 that passes through (4,9) (4, 9) is:

y=2x+1 y = 2x + 1

Answer

y=2x+1 y=2x+1

Exercise #6

A line has a slope of 12 \frac{1}{2} and passes through the point (5,1712) (5,17\frac{1}{2}) .

Which expression corresponds to the line?

Video Solution

Step-by-Step Solution

To determine the line's equation, we'll follow these steps:

  • Use the point-slope form of a line, given by yy1=m(xx1) y - y_1 = m(x - x_1) .
  • Substitute m=12 m = \frac{1}{2} , x1=5 x_1 = 5 , and y1=1712 y_1 = 17\frac{1}{2} into the equation.
  • Solve for y y to put the equation in slope-intercept form.

Now, let's work through the steps:

Given the point (5,1712) (5, 17\frac{1}{2}) and slope m=12 m = \frac{1}{2} , our start point is the point-slope form:
y1712=12(x5) y - 17\frac{1}{2} = \frac{1}{2}(x - 5) .

Convert the mixed number to an improper fraction: 1712=352 17\frac{1}{2} = \frac{35}{2} .

Thus, the equation becomes y352=12(x5) y - \frac{35}{2} = \frac{1}{2}(x - 5) .

Distribute the slope on the right-hand side:
y352=12x52 y - \frac{35}{2} = \frac{1}{2}x - \frac{5}{2} .

To solve for y y , add 352 \frac{35}{2} to both sides:
y=12x52+352 y = \frac{1}{2}x - \frac{5}{2} + \frac{35}{2} .

Combine the fractions on the right-hand side:
y=12x+302 y = \frac{1}{2}x + \frac{30}{2} , which simplifies to y=12x+15 y = \frac{1}{2}x + 15 .

Therefore, the equation of the line in slope-intercept form is y=12x+15 y = \frac{1}{2}x + 15 .

Comparing this with the multiple-choice options, the correct answer is:

y=12x+15 y = \frac{1}{2}x + 15

Answer

y=12x+15 y=\frac{1}{2}x+15

Exercise #7

Given the line parallel to the line y=2x5 y=2x-5

and passes through the point (3,4) (-3,-4) .

Which of the algebraic representations is the corresponding one for the given line?

Video Solution

Step-by-Step Solution

To solve this problem, follow these steps:

  • Step 1: Identify the given line's slope. The given line is y=2x5 y = 2x - 5 , which has a slope of 2 2 .
  • Step 2: Since the line we want is parallel, it will have the same slope, m=2 m = 2 .
  • Step 3: Use the point-slope formula, yy1=m(xx1) y - y_1 = m(x - x_1) . Given point is (3,4)(-3, -4).
  • Step 4: Substitute m=2 m = 2 , x1=3 x_1 = -3 , and y1=4 y_1 = -4 into the point-slope formula:
    y(4)=2(x(3)) y - (-4) = 2(x - (-3))
  • Step 5: Simplify the equation:
    y+4=2(x+3) y + 4 = 2(x + 3)
  • Step 6: Distribute the 22:
    y+4=2x+6 y + 4 = 2x + 6
  • Step 7: Solve for y y :
    y=2x+64 y = 2x + 6 - 4
  • Step 8: Simplify further:
    y=2x+2 y = 2x + 2

The corresponding equation of the line parallel to y=2x5 y = 2x - 5 and passing through (3,4)(-3, -4) is y=2x+2 y = 2x + 2 . When compared to the choices given, the correct choice is:

y=2x+2 y=2x+2

Answer

y=2x+2 y=2x+2

Exercise #8

A straight line has a slope of 6y and passes through the points (6,41) (6,41) .

Which function corresponds to the line described?

Video Solution

Step-by-Step Solution

To solve the exercise, we will start by inserting the available data into the equation of the line:
y = mx + b
41 = 6*6 + b
41 = 36 +b
41-36 = b
5 = b
 
Now we have the data for the equation of the straight line:
 
y = 6x + 5
But it still does not match any of the given options.

Keep in mind that a common factor can be excluded:
y = 2(3x + 2.5)

Answer

y=2(3x+212) y=2(3x+2\frac{1}{2})

Exercise #9

A line has a slope of 112 1\frac{1}{2} and passes through the point (3,712) (3,7\frac{1}{2}) .

Which expression corresponds to the line?

Video Solution

Step-by-Step Solution

To solve the problem of finding the equation of the line:

  • Step 1: Identify the given information: slope m=112=32 m = 1\frac{1}{2} = \frac{3}{2} , and point (x1,y1)=(3,712)=(3,152)(x_1, y_1) = (3, 7\frac{1}{2}) = (3, \frac{15}{2}).
  • Step 2: Use the point-slope formula yy1=m(xx1) y - y_1 = m(x - x_1) .
  • Step 3: Substitute the given slope and point into the formula: y152=32(x3) y - \frac{15}{2} = \frac{3}{2}(x - 3) .
  • Step 4: Distribute the slope on the right side: y152=32x92 y - \frac{15}{2} = \frac{3}{2}x - \frac{9}{2} .
  • Step 5: Add 152\frac{15}{2} to both sides to solve for y y : y=32x92+152 y = \frac{3}{2}x - \frac{9}{2} + \frac{15}{2} .
  • Step 6: Simplify the right side: y=32x+3 y = \frac{3}{2}x + 3 .
  • Step 7: Compare this expression to the provided choices to find a match. The form is the same as choice y=112(x+2) y=1\frac{1}{2}(x+2) , rewritten correctly as y=32(x+2) y = \frac{3}{2}(x + 2) .

Therefore, the expression that corresponds to the line is y=112(x+2) y = 1\frac{1}{2}(x+2) .

Answer

y=112(x+2) y=1\frac{1}{2}(x+2)

Exercise #10

A straight line with a slope of 2 passes through the point (7,11) (7,11) .

Which expression corresponds to the line?

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the given information.
  • Step 2: Apply the point-slope formula.
  • Step 3: Simplify to match one of the given options.

Now, let's work through each step:

Step 1: The problem gives us the slope m=2y m = 2y and the point (7,11) (7, 11) .

Step 2: Using the point-slope form of a line, yy1=m(xx1) y - y_1 = m(x - x_1) , we substitute y1=11 y_1 = 11 , m=2y m = 2y , and x1=7 x_1 = 7 . The equation becomes:

y11=2y(x7) y - 11 = 2y(x - 7)

Step 3: Simplify the equation:

  • Multiply through: y11=2yx14y y - 11 = 2yx - 14y .
  • Rearrange terms to solve for y y :
  • Start by moving y y on one side and other terms on the other: y2yx=14y+11 y - 2yx = -14y + 11 .
  • Rearranging gives y11+14y=2yx y - 11 + 14y = 2yx .
  • This rearranges to: 15y=2yx+11 15y = 2yx + 11 .
  • Or separating terms appropriately and simplifying: y=3x3x y = 3x - 3 - x .

Therefore, the solution to the problem is y=3x3x y = 3x - 3 - x , which corresponds to choice 4.

Answer

y=3x3x y=3x-3-x

Exercise #11

Given the line parallel to the line

y=34x+2 y=-\frac{3}{4}x+2

and passes through the point (8,2) (8,2) .

Which of the algebraic representations is the corresponding one for the given line?

Video Solution

Step-by-Step Solution

To solve this problem, we'll determine the equation of the line that is parallel to y=34x+2 y = -\frac{3}{4}x+2 and passes through the point (8,2) (8,2) .

Step 1: Identify the slope of the given line.
The slope (m m ) of the line y=34x+2 y = -\frac{3}{4}x + 2 is 34-\frac{3}{4}, as it's the coefficient of x x .

Step 2: Use the point-slope form, yy1=m(xx1) y - y_1 = m(x - x_1) , where m=34 m = -\frac{3}{4} and the point (x1,y1)=(8,2) (x_1, y_1) = (8, 2) .

Substitute into the point-slope form:
y2=34(x8) y - 2 = -\frac{3}{4}(x - 8)

Step 3: Simplify this equation to obtain the slope-intercept form:
y2=34x+34×8 y - 2 = -\frac{3}{4}x + \frac{3}{4} \times 8

Calculate the right side:
y2=34x+6 y - 2 = -\frac{3}{4}x + 6

Add 2 to both sides to isolate y y :
y=34x+6+2 y = -\frac{3}{4}x + 6 + 2
y=34x+8 y = -\frac{3}{4}x + 8

This equation, y=34x+8 y = -\frac{3}{4}x + 8 , is in slope-intercept form and matches choice 4.

Thus, the equation of the line parallel to y=34x+2 y = -\frac{3}{4}x + 2 and passing through (8,2) (8, 2) is y=34x+8\boxed{y = -\frac{3}{4}x + 8}.

Answer

y=34x+8 y=-\frac{3}{4}x+8