Question 309731
1)2x-y=20
3x+2y=-19
ans:         2x-y=20
           or,6x-3y=60............(1)
             3x+2y=-19
          or,6x+4y=-38............(2)
       
        6x-3y=60
        6x+4y=-38
      (-) (-)=(+)
      ------------------
         -7y=98
              98      
         or,y=--
         .    -7
        . .y=-14           
  put y to the ftrst eqution.
           6x-3(-14)=60
           or,6x+42=60
           or,6x=60-42
           or,6x=18               x=6
           or,x=18/6              y=-7
           or,x=6