Question

10m-9n=15

Answer 1

he answer would be n = 5/9 (2 m-3)

Answer 2

10m - 9n = 15 (eq1)
5m - 4n = 10 (eq2)

eq1 - 2 x eq2,
10m - 9n - 10m + 8n = 15 - 20
-n = -5
n = 5

Sub n=5 into eq2,
5m - 4(5) = 10
5m - 20 = 10
5m = 10 + 20
5m = 30
m = 6

Answer 3

no the answer is 15 = m