Question 61681
is to be solved by addition. 
1st: 5x-3y=13 
2nd: 4x-3y=11 
Multiply 2nd by -1 to get:
3rd: -4x+3y=-11
Add 3rd to 1st to get:
x=2
Substitute into 2nd to solve for "y":
4(2)-3y=11
-3y=2
y=-1
Check in 1st:
5(2)-3(-1)=13
10+3=13
13=13
Cheers,
Stan H.