考试类型: Mathematics > Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

If the graph of the function f is a line with slope 2, which of the following could be the equation of f?

A. f(x)=4x-2

B. f(x)=2x+4

C. f(x)=-2x-2

D. f(x)=-2x+2

E. f(x)=-1/2x+(1/2)

正确答案:B

解析:

The graphs of all the given functions are lines, and the equations are all in the form y=mx+b. When a linear equation is in the form y=mx+b, the slope of the graph of the equation is m, the coefficient of x. The graph of the function f is a line with slope 2, so the only choice that could be the equation of f is f(x)=2x+4.