Question

Resolva o sistema:
9X+2Y=15
X+5Y=30

Answer 1

X=30-5Y
9.(30-5Y) +2Y=15
270-45Y+2Y=15
-43Y=15-270
-43Y=255
Y=255/43

X=30-5.(255/43)
X=30-1275/43
X=15/43

o valor de Y é 255/43 e o do X 15/43