Question

Which of the points shown below are on the line given by the equation y = 2x? Check all that apply.A. Point A: (1, -1) B. Point B: (1, 3) C. Point C: (-2, -4) D. Point D: (-2, 4)

Answer 1

The answer is not y = 4 as required, so point D does not lie on y = 2x.

Answer 2

Substitute each value of x, calculate, and if the answer equals to the given value of y, then the point does lie on y = 2x

Point A (1, -1)

y = 2(1)
y = 1

The answer is not y = -1 as given in the question, hence point A does not lie on y = 2x

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Point B (1, 3)

y = 2(1)
y = 2

The answer is not y = 3 as required, hence point B does not lie on y = 2x
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Point C(-2, -4)

y = 2(-2)
y = -4

The answer is y = -4 as required. Hence, point C does lie on y = 2x
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Point D(-2, 4)

y = 2(-2)
y = -4

The answer is not y = 4 as required, so point D does not lie on y = 2x.
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Correct Answer: C