Question

решите систему уравнений ( 5х - у = 7,
(3х + 2у = - 1

Answer 1

5х-у=7 |*2

3х+2у=-1

10х-2у=14

3х+2у=-1

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13х=13

х=1

3*1+2у=-1

3+2у=-1

2у=-4

у=-2

Answer 2

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