Question

помогите пж дам 20 баллов​

Answer 1

Ответ:

1) (-5,1)

2x - y = -1

x + y = 4         //-1

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2x - y = -1

-x - y = -4

x = -5

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-5 + y = -4

y = 1

2) (7,-2)

2x - y = 16             //4

3x + 4y = 13

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8x - 4y = 64

3x + 4y = 13

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11x = 77

x = 7

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3(7) + 4y = 13

4y = 13 - 21

y = -8/4

y = -2