Question

respondam aí pra mim 2x-y=7 x+3y=-7

Answer 1

2x - y = 7
x + 3y = -7  ×(-2) ⇒ -2x - 6y = 14

-7y = 21
y = -3

2x - (-3) = 7
2x + 3 = 7
2x = 4
x = 2