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题目内容 (请给出正确答案)
单选题
If 3x+y = c and x+y = b, what is the value of x in terms of c and b?
A

(c-b)/3

B

(c-b)/2

C

(b -c)/3

D

(b-c)/2

E

(c-b)/4


参考答案

参考解析
解析:
Eliminate y by subtracting corresponding sides of the given equations: 3x+y=c, x+y=b. Therefore 2x+0=c-b, so x= (c-b)/2
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