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Mathematics>Standard Multiple Choice

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

答案和解析

答案：A

解析：

Choice A is correct.