Question 410723
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Hi

  5x-2y=4  
  3x+y=9 

  15x-6y=12  
  15x+5y=45   |all good work

   15x-6y=12  
  -15x-5y=-45  |need to multiply thru with -1 in the 2nd Eq to eliminate x
      -11y = -33
         y = 3  and x = 2 (from 2nd Eq on top 3x = -y + 9, x = 6/3)

CHECKING our Answer***
 3*2 + (3) = 9
&5*2 -2*3 = 4