Through Which Points Does the Graph of x = y - 4 + 2x Pass?

Linear Equations with Variable Isolation

Look at the following function:

x=y4+2x x=y-4+2x

Through which of the following points does the graph of the function pass?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:08 Let's find out which points the function passes through.
00:12 First, we'll arrange the function to isolate Y.
00:24 Here is the function's equation.
00:28 At each point, the left number is the X-axis and the right is Y.
00:34 Let's substitute each point into the equation to see if it fits.
00:39 It fits. So, this point is on the line.
00:44 Now, let's find other points on the line using the same method.
00:49 Moving to the second point, substitute it into the equation.
00:54 It doesn't fit. So, this point isn't on the line.
00:58 Next, try the third point in the equation.
01:02 It doesn't fit. So, this point isn't on the line.
01:07 Now, substitute the fourth point into the equation.
01:13 It doesn't fit. So, this point isn't on the line.
01:18 And that's how we find which points lie on the line. Great job!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Look at the following function:

x=y4+2x x=y-4+2x

Through which of the following points does the graph of the function pass?

2

Step-by-step solution

To determine through which point the function passes, we begin by simplifying the given equation.

Given: x=y4+2x x = y - 4 + 2x

Rearranging the terms to solve for y y :

x=y4+2x x = y - 4 + 2x

Subtract x x from both sides to isolate the terms involving y y :

0=y4+x 0 = y - 4 + x

Rearrange to solve for y y :

y=x+4 y = -x + 4

Now, we will test each point to see which satisfies the equation y=x+4 y = -x + 4 .

  • For (1,5) (-1, 5) , substitute x=1 x = -1 :
  • y=(1)+4=1+4=5 y = -(-1) + 4 = 1 + 4 = 5

    This point satisfies the equation.

  • For (0,5) (0, 5) , substitute x=0 x = 0 :
  • y=(0)+4=4 y = -(0) + 4 = 4

    This point does not satisfy the equation.

  • For (1,5) (1, 5) , substitute x=1 x = 1 :
  • y=(1)+4=1+4=3 y = -(1) + 4 = -1 + 4 = 3

    This point does not satisfy the equation.

  • For (2,5) (2, 5) , substitute x=2 x = 2 :
  • y=(2)+4=2+4=2 y = -(2) + 4 = -2 + 4 = 2

    This point does not satisfy the equation.

Therefore, the graph of the function passes through the point (1,5)(-1, 5).

3

Final Answer

(1,5) (-1,5)

Key Points to Remember

Essential concepts to master this topic
  • Simplification: Combine like terms by moving all x terms together
  • Technique: Subtract x from both sides: x = y - 4 + 2x becomes 0 = y - 4 + x
  • Check: Substitute point coordinates into simplified equation y = -x + 4 ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to combine like terms with x
    Don't leave the equation as x = y - 4 + 2x and try to substitute points directly = confusing results! This creates an equation with x on both sides that's hard to work with. Always combine like terms first by moving all x terms to one side.

Practice Quiz

Test your knowledge with interactive questions

Which statement best describes the graph below?

xy

FAQ

Everything you need to know about this question

Why can't I just substitute points into the original equation?

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You could, but it's much harder! With x on both sides, you'd need to solve for one variable each time. Simplifying to y=x+4 y = -x + 4 first makes checking points much easier.

How do I know which variable to solve for?

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Usually solve for y because it gives you the familiar y=mx+b y = mx + b form. This makes it easy to substitute x-values and check if you get the correct y-values.

What if I get 0 = 0 when combining like terms?

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That means the equation is an identity - it's true for all points! But that's not the case here since we got y=x+4 y = -x + 4 , which represents a specific line.

Why does only (-1, 5) work when y = 5 for all options?

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Great observation! Since all points have y=5 y = 5 , we need 5=x+4 5 = -x + 4 . Solving: x=1 x = -1 . So only (-1, 5) satisfies our equation.

Can I check my answer by plugging back into the original equation?

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Absolutely! For (-1, 5): 1=54+2(1)=542=1 -1 = 5 - 4 + 2(-1) = 5 - 4 - 2 = -1 ✓. This confirms our simplified equation was correct.

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