Question

8x+y=-16 -3x=-5-y elimination

Answer 1

$8x+y=-16 \ \ \ |\times (-1) \\ -3x=-5-y \\ \\ -8x-y=16 \\ \underline{-3x+y=-5} \\ -8x-3x=16-5 \\ -11x=11 \\ x=-1 \\ \\ 8x+y=-16 \\ 8 \times (-1)+y=-16 \\ -8+y=-16 \\ y=-16+8 \\ y=-8 \\ \\ x=-1 \\ y=-8$