Question

$x=y-2\\2x+y=-1$

Answer 1

x = y - 2

2x + y = -1

2(y - 2) + y = -1

2y - 4 + y = -1

3y = -1 + 4

3y = 3

y = 3/3

y = 1

x = 1 - 2

x = -1

prova real:

2 · (-1) + 1 = -1

-2 + 1 = -1

-1 = -1