Question 746642
7x + 2y = 24
8x + 2y = 30

Subtract

-x      = -6
 x      = 6

Substitute x = 6
into 7x + 2y = 24

7(6)+ 2y = 24
42 + 2y  = 24 
     2y = 24 - 42
     2y = -18
      y = -9

     {6,-9}