Question

Oblicz x oraz y

/(x+5)(y-2)=(x+2)(y-1)

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\(x-4)(y+7)=(x-3)(y+4)

Answer 1

xy-2x+5y-10=xy-2+2y-x

xy-28+7x-4y=xy+4x-3y-12

-2x+x+5y-2y=-2+10

7x-4x-4y+3y=-12+12

-x+3y=8     /.3

3x-y=16

-3x+9y=24

3x-y=16

8y=40

y=5

-3x-5=16

-3x=16+5

-3x=21

x=-7

y=5