Question 167542
5x + 5y  = -13 .......(1)

7x - 3y = 17 ............(2)


(1) * 3  & (2) * 5 

  5x * 3  + 5y * 3  = -13* 3 
      15 x  + 15 y = - 39 ............(3)

7x * 5 - 3y * 5  = 17 *5 
   35 x  - 15 y  = 85  ..........(4)

(3) + (4)

   50x   =  46 
 

       x = 46 /50  = 0.92 

substituting x =0.92 in (1)

    5 * 0.92 + 5y = -13 
      4.6  + 5y = -13 


             5y = -13 - 4.6  = -17.6 
              y = -17.6 / 5 =  -3.52