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2x-y=9/*2
3x+2y=9
4x-2y=18
7x=27/:7
x=27/1*1/7
x=3 6/7
3*3 6/7+2y=9
3* 27/7=81/7=11 3/7
2y=9-11 3/7
2y= -2 4/7:2
y=-9/7
x=3 6/7
y= -9/7=-1 2/7
2x - y = 9
3x+2y=9
4x -2y= 9
7x= 18
x= 18/7 = 2 4/7
36/7- y = 9
y= -3 6/7