Algebra 2 help pleaseee!!!!!!!

don't know how to do this. please work out all three and explain the steps.

Use an inverse matrix to solve the linear system.
3x + 5y = -7
x - 3y = 7

and

-2x + 5y = 11
3x - 4y = 15

and lastly

8x + y =11
3x + y = 6



Thanks ! I did the other problems, but I can't do these

3x + 5y = -7
x - 3y = 7
(1,-2)

-2x + 5y = 11
3x - 4y = 15
(17,9)

8x + y =11
3x + y = 6
(1,3)

try this for help http://www.algebra.com/algebra/homework/Matrices-and-determiminant/inverse-of-2x2-matrix.solver