ОЧЕНЬ СРОЧНО УМОЛЯЮЮЮумоляю методом сложения систему уровнения


1) 4x+2y=5


4x-6y=-7


2)


6x+7y=2


3x-4y=46


3)


2x-3y=8


7x-5y=-5


4)


6x-7y=40


5y-2x=-8
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