Carcass wrote:
Which one of the following is the solution of the system of equations given?
x + 2y = 7
x + y = 4
(A) x = 3, y = 2
(B) x = 2, y = 3
(C) x = 1, y = 3
(D) x = 3, y = 1
(E) x = 7, y = 1
Given
x + 2y = 7........................1
x + y = 4.........................2
Deduct 2 from 1 :
y = 3.
Now put the value of y into the 1.
x = 1.
The answer is C.