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A line passes through the point (−1, 2). Which of the following *CANNOT* be the equation of the line?

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A
y=x+1

y=mx+b

We know the line passes through (−1,2). It could have a slope, it could be vertical (x=−1), or it could be horizontal (y=2).

Plug x=−1 into all four equations to see which equation is not satisfied. The only answer choice that doesn’t give us y=2 is y=x+1.

Explaination

The slope-intercept form of a line is: y=mx+b

We know the line passes through (−1,2). It could have a slope, it could be vertical (x=−1), or it could be horizontal (y=2).

Plug x=−1 into all four equations to see which equation is not satisfied. The only answer choice that doesn’t give us y=2 is y=x+1.

B y=1−x

C x=−1

D y=x+3

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