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Mathematics>Standard Multiple Choice

Read the following sat test question and thenclick on a button to select your answer.

Which of the following equations represents a line inthe x y-plane with an x-intercept (-2,0) and a slopeof 4?

A.y=4x+8

B.y=-4x+8

C.y=4x-2

D.y=-4x-2

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答案：A

解析：

Option A is correct. If the slope of the line is 4, then an equation for it would be in the form y=4x+b. Then, substituting the x- and y-coordinates of the given point to satisfy the equation yields 0=4(-2)+b. Solving for b yields b=8, so an equation that represents the given conditions is y=4x+8.

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