Question

Which equation has (2, -1) as a solution

A. y = 2x - 1
B. y = x + 3
C. y = x - 3
D. y = - 2x + 1

Answer 1

C.
`y=x-3`

Explanation:

To find the answer to the problem, you plug in the values for
`x` and
`y`.

Let's plug them in and see which equation is true.

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`-1=2(2)-1\\-1=4-1\\-1=3`

Not true.

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`-1=2+3\\-1=5`

Not true.

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`-1=2-3\\-1=-1`

True.

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`-1=-2(2)-1\\-1=-4-1\\-1=-5`

Not true.

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