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Ответ

Ответ дан
asenysh250103

Ответ:

Объяснение:

1. x=10-y

подставим в 1

(10-y)^2-y^2=20

100-20y+y^2-y^2=20

-20y=-80

y=4

x=10-4=6

Ответ: (6;4)

2. x=-30/y

(-30/y)^2+y^=61

900/y^2+y^2=61

900+y^4=61y^2

y^4-61y^2+900=0

y^2=z

z^2-61z+900=0

z1=25

z2=36

y^2=25

y=+-5

y^2=36

y=+-6

x1 =-30/5=-6

x2=-30/-5=6

x3=-30/6=-5

x4=-30/-6=5

Ответ: (-6;5); (6;-5);(-5;6);(5;6)

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