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2y-x=10
x=10-2y
I. 3x+2y=29
3(10-2y)+2y=29
30-6y+2y=29
-4y=29-30
-4y=-1
y=1/4
II. 2y-x=10
2(1/4)-x=10
1/2-x=10
-x=10-1/2
-x=20/2-1/2
-x=19/2
x= (-19/2)
x = (-9 1/2)
3x + 2y = 29
-x + 2y = 10
3x +2y = 29 _
-4x = -19
x = 4,75