You can
put this solution on YOUR website!Let x = the first number and y = the second number. You can write:
3x - y = 9 Three times the 1st number (3x) decreased by the 2nd number (-y) = 9
2x + y = 11 Two times the 1st number (2x) increased by the 2nd number (+y) = 11
There are the two equations you need. Can you take it from here?