X=-1 y=3 or (-1,3)
To solve this you can use substitution or elimination 
In this I’ll use elimination 
So,
(-3)2x-3y=-11  —->     -6x+9y=33
(2)3x+4y=9    ——>   6x+8y=18
Then you add the equations 
-6x+6x=0           9y+8y=17y     18+33=51
So,  17y=51 divide by 17 and you get y=3
Then you can substitute 3 in one equation for y.
2x-3(3)=-11
2x-9=-11      2x=-2    X=-1