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x-y=10. x+2=6
______-. 2x=6
2y=-4. x=6:2
y=-4:2/-4:-2. x=3
y=-2/2
b. 3x+2y=12. x+2y=4
x+2y. = 4. 4+2y=4
_______-. 6y=4
2x=8. y=4
x=8:2. _
6
x=4. y=2
_
3