Question

x+2y=15 2x-4y=50 respostas e resolucao

Answer 1

x+2y=15(2)      2x+4y=30

2x-4y=50        2x-4y= 50
                        4x=80
                        x=80/4
                       x=20
Usando x+2y=15 para achar o valor de y
20+2y=15
2y=15-20
2y=-5
y=-5/2