Question

{x+2y=3
{2x - 2y =-6​

Answer 1

$x = 3 - 2y \\ 2x - 2y = - 6 \\ \\ x = 3 - 2y \\ 2(3 - 2y) - 2y = - 6 \\ \\ x = 3 - 2y \\ 6 - 4y - 2y = - 6 \\ \\ x = 3 - 2y \\ 6 - 6y = - 6 \\ \\ x = 3 - 2y \\ - 6y = - 6 - 6 \\ \\ x = 3 - 2y \\ - 6y = - 12 \\ \\ x = 3 - 2y \\ y = \frac{ - 12}{ - 6} \\ \\ x = 3 - 2y \\ y = 2 \\ \\ x = 3 - 2 \times 2 \\ y = 2 \\ \\ x = 3 - 4 \\ y = 2 \\ \\ x = - 1 \\ y = 2$