Help and explain please
9m+n=22
m-3n=18
Assuming you want to solve these simultaneously.
9m + n = 22
m - 3n = 18
To eliminate variable n, mulyiply the first equation by 3
3(9m + n = 22) = 27m + 3n = 66
Now add these two equations together
27m + 3n = 66
m - 3n = 18
28m + 0 = 84
28m = 84
m = 3
Substitute m = 3 in m - 3n = 18, to find n
m = 3
m - 3n = 18
3 - 3n = 18
-3n = 15
n = -5
So, the solution is,
(3, -5)