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

y^2-y-3(1-x)
y=2x

If (x1,y1) and (x2,y2) are two distinct solutions to the system of equations shown above, what is the sum of x1 and x2?

A.-1/4
B.1/4
C.1
D.-1

来源:可可英语 http://www.kekenet.com/sat/202006/613088.shtml