Question 229245
The difference between 2 positive integers is 36. One integers is three times as great as the other. Find the integers.

I took the liberty of representing each integer as a different variable, so:
Y-X=36
Y-3X=0

If you multiply the 2nd equation by -1
Y-X=36
-Y+3X=0

From here you add the 2 equations together

0+2X=36
X=18

Now you plug that back into the original function.
Y-18=36
Y=54

And this is true because 
54-3*18=0
54-54=0

So
One Integer is 54, the other is 18.