You should learn to check your own work.  Here's how:

Substitute x=3 and y=2 into each of the two equations:

    7x-4y = 13         |            3x+y = 11
7(3)-4(2) = 13         |        3(3)+(2) = 11
                       |
Do the operations      |        Do the operations  
on the left side       |        on the left side 
and see if you get:    |        and see if you get:
                       |
       13 = 13         |             11 = 11

If you do get that in both cases, then you'll know your answer 
is correct.  If you don't get that in either case you will know
that you made a mistake.

Edwin