Question 254222
2m=n-3
3m=2n+9

adding or subtracting method is also called elimination method
It is the most magical.
multiply the first by 3 all the way through
multiply the second by 2 all the way through
now you have 6m in both 
subtract one of the new equations from the other new one
and you no longer have m m has been eliminated or subtracted away.
solve for n