Question

3m-9n=24; n=-1,1,3

Answer 1

3m - 9n =24 when n = -1
plug in n into the equation and you get

3m - 9(-1) = 24 => 3m + 9 = 24
now solve for m
this means try and get m by itself without any coefficient (number in the front)
so:

3m+ 9-9 = 24-9 => subtracting 9 on both sides

you now have 3m = 15
at this point you have to get rid of the 3 on the left hand side
how to do this is multiplying by the reciprocal which is 1/3

m = 3.

That is just for when n = -1
Now do the same steps for when n = 1 & n = 3