Question

(x + y = 17. (2x - y = 19

Answer 1

{x+y=17
{2x-y=19

-y=19-2x
y=-19+2x

x-19+2x=17
x+2x=17+19
3x=36
x=36/3
x=12

y=-19+2×12
y=-19+24
y=5

espero ajudar ♥

Answer 2

x + y = 17
2x-y = 19

x = 17-y

2(17-y) -y= 19
34-2y -y = 19
3y = 15
y = 5

x = 17-y
x = 17-5
x = 12