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

来源:可可英语 http://www.kekenet.com/sat/201503/366444.shtml