Question

x=5-3y
2x-y=-4
qual o valor dessa conta?

Answer 1

X=5-3y ==> x = 5 -2.(2) ==> x = 5 - 4 ==> x = 1
2x-y=-4

2(5-3y) - y = - 4

10 - 6y - y = - 4

7y = 14

y = 2