Question

Calcule x e y de modo que(5x+2,2x+y=(12,5).

Answer 1

5x+2 = 12
5x=12-2
5x=10
x=2
========= substituindo:
2x+y = 5
2(2) + y = 5
4 + y = 5
y = 5 - 4
y = 1

entao, x=2 e y=1 

:D