Question

resolva o sistema
2x -y =22
x+ 2y = -3

Answer 1

2x - y = 22
x + 2y = - 3      (-2)

2x - y = 22
-2x - 4y = 6
--------------------
       -5y = 28
y = - 28/5

2x - y = 22
2x - (-28/5) = 22
2x + 28/5 = 22
2x = 22 - 28/5
2x = (110 - 28) / 5
2x = 82/5
x = 82/5 ÷ 2
x = 82/5 . 1/2
x = 82/10    (÷2)
x = 41/5

Resposta: 
x = 41/5
y = - 28/5

Answer 2

2x -y =22
x+2y=-3

2x - y=22 .(2) vai ficar:

4x-2y=44
x+2y=-3
(corta o -2y com +2y, fica:)
5x=41
x=41/5
x=8,2
substituindo :
8,2 + 2y = -3
2y= -3 -8,2
y= 5,2 / 2
y= 2.6