whats x-y=-3 and whats 2x+y =12
\(x-y=-3 \ \ => \boxed{x=-3+y} \\ \\ 2x+y=12 \\ \\ 2(-3+y)+y=12 \\ \\ -6+2y+y=12 \\ \\ 3y=12+6 \\\\ 3y=18 \\ \\ \boxed{y=\frac{18}{3}=6} \\ \\ x=-3+6 \\ \\ \boxed{x=3}\)
x - y = 32x + y = 12x = 3 + y2(3 + y) + y = 126 + 2y + y = 123y = 12 - 63y = 6y = 6/3y = 2x = 3 + 2x = 5
