Question

8m+7n=22

x+6y=-3

2x+13y=-8​

Answer 1

$8m + 7n = 22 \\ 8m = 22 - 7n \\ m = \frac{22 - 7n}{8} \\ m = \frac{22}{8} - \frac{7n}{8} \\ m = \frac{11}{8} - \frac{7}{8} n$

$x + 6y = - 3 \\ x + 6y + 3 = - 3 + 3 \\ x + 6y + 3 = 0$

$2x + 13y = - 8 \\ 2x + 13y + 8 = - 8 + 8 \\ 2x + 13y + 8 = 0$