Question

x + 2y = 16 {x - 2y = -2 método da adiçao

Answer 1

{x+2y=16
{x-2y=-2
2x=14
x=14/2
x=7
x-2y=-2
7-2y=-2
-2y=-2-7
-2y=-9.(-1)
2y=9
y=9/2
S={7, 9/2}