Question

Calcule 8y + 6× =72
2y +3 ×=24

Answer 1

8y+6x=72
2y+3x=24
Isolando o X
2y+3x=24
3x=24-2y
x=24-2y/3
Substituindo no sistema 8y+6x=72
8y+6(24-2y/3)=72
8y+114-12y/3=72
8y+144-12y=216
-4y=72
y=-72/4
y=-18
Agora substitui o Y no sistema x=24-2y/3
x=24-2.(-18)/3
x=24+36/3
x=60/3
x=20

S={ 20, -18}