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)/3B(c-b)/2C(b -c)/3D(b-c)/2E(c-b)/4
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
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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