Question

решите систему уравнений
5x-y=7
3x+2y=-1

Answer 1

$left { {{y = 5x - 7,} atop {3x + 2(5x - 7) + 1 = 0}} right.$
3x + 2(5x - 7) + 1 = 0
3x + 10x - 14 + 1 = 0
13x - 13 = 0
13x = 13
x = 1

$left { {{x = 1} atop {y = 5 - 7 = -2}} right.$

Answer 2

спасибо большое