Question

Given the system of equations, what is the solution?
x + 2y = 7
x - 2y = -1
{(-8, -12)}
{(3, 2)}
{(-4, 6)}

Answer 1

3,2
adding both the eqn we get 2x=6 i.e x=3

Answer 2

and substitiing the value of x=3 in any of the eqn we get:3+2y=7
2y=4=>y=2

Answer 3

x+2y=7 (1)
x-2y=-1 (2)
(1) + (2) => 2x = 6 => x= 3 combined with (1) => 3 + 2y = 7 => y =2.
So: (x,y) = {(3,2)} is right!