Question

{ 2x +y-4=0
{x+2 (x-y) =-1

Answer 1

Resposta:

$2x + y - 4 = 0 \\ x + 2(x - y) = -1 \\ \\ y = - 2x + 4 \\ x + 2x - 2y = - 1 \\ \\ y = - 2x + 4 \\ 3x - 2y = - 1 \\ \\ y = - 2x + 4 \\ 3x - 2( - 2x + 4) = - 1 \\ \\ y = - 2x + 4 \\ 3x + 4x - 8 = - 1 \\ \\ y = - 2x + 4 \\ 7x = 7 \\ \\ y = - 2(1) + 4 \\ x = 1 \\ \\ y = - 2 + 4 \\ x = 1 \\ \\ y = 2 \\ x = 1$