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Ответ:

a) X=6-y в) X=y-2

6-y-y=2 y-2+3y=-10

2y=4 | :2 4y=-8 | :4

y=2,X=4. y=-2,X=-4

б) X=7-y г) y=4-2x

7-y-y=3 3x-4+2x=1

2y=4 | :2 5X=5

y=2,X=5 X=1,y=2