4x+3y=-10

2x-9y=-26

cпособ подстановки

____________________

3x+2y=6

x-2y=4

cпособ подстановки

_____________________

4x-y=15

8x+y=9

cпособ подстановки

_____________________

3x+4y=7

9x-2y=91

cпособ подстановки

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