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2x-y=4..........(2) >> 10x-5y=20 -
-y = -2
y = 2
2x - y = 4 x5 10x -5y = 20 -
-1y= -2
y=2
5x -3y =9 5x-3.2 =9 5x=9 + 6 x=15 =3
5
x+y= 3+2 =5