Question

Решите графически систему уравнений ∫x-y=3,
∫ 3x-y=13.
Заране, спасибо!

Answer 1

<=>{x=3-y <=>{y=7 <=>{y=7

{3*3-y=13 {×=3-y {×=-4

__________ ______

-y=13-6 x=3-7

-y=7 x=-4

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