Question

[х-у=6
[4у-у=12 по.мо.ги.те

Answer 1

$x - y = 6 \: \: \: \: x - y = 6 \\4y - y = 12 \: \: \: \: \: 3y = 12$

x - y = 6

y = 4

( x ; y )=(2 ; 4)

x-4=6

x=10