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
00:00 Find through which points the function passes
00:03 Let's arrange the function, isolate Y
00:16 This is the function equation
00:19 In each point, the left number represents X-axis and the right Y
00:23 Let's substitute each point in the line equation and see if possible
00:31 Possible, therefore the point is on the line
00:34 Let's use the same method and find which points are on the line
00:37 Moving to the second point, let's substitute in the line equation
00:42 Not possible, therefore the point is not on the line
00:45 Moving to the third point, let's substitute in the line equation
00:51 Not possible, therefore the point is not on the line
00:54 Moving to the fourth point, let's substitute in the line equation
01:05 Not possible, therefore the point is not on the line
01:08 And this is the solution to the question

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

What is the solution to the following inequality?

\( 10x-4≤-3x-8 \)

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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