Question

9m+6m =-12
4m-5 n =10​

Answer 1

9m + 6m = -12 // A

4m - 5n = 10 // B

15m = -12

$m = - \frac{12}{15}$

4m - 5n = 10

$4 \times ( - \frac{12}{15} ) - 5n = 10 \\ - \frac{48}{60} - 5n = 10 \\ - 0.8 - 10 = 5n \\ - 10.8 \div 5 = n \\ n = -2.16$