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x=448/y
wyliczamy drugie równanie:
xy-2x+4y-8=448
podstawiamy do
448y/y - 2*(448/y) + 4y -8-448=0
448- 896/y + 4y-8-448=0 mnożymy wszystko razy y
-896+4y^2 -8y =0
liczymy deltę:
64+14336=14400 pierw z delty to 120
x1 = (8-120)/8 =14
x2 = (8+120)/8=16