Question

no momento sou vou perguntar mat ok galerinha ajuda aew
x+y=4
2x-y=5

Answer 1

X+Y=4
X=4-Y

2X-Y=5
2(4-Y)-Y=5
8-2Y-Y=5
-3Y=5-8
-3Y=-3
Y=-3/-3

Y=1

X=4-Y
X=4-1
X=3

VALEU!