Rozwiąż ukłąd równań (x+8)(y−1)= 80 xy= 60

(x+8)(y−1)= 80 xy= 60 xy-x+8y-8=80 xy=60 60-x+8y-8=80 xy=60 -x+8y=28 xy=60 -x+8y=28 y=60/x -x+8*60/x=28/*x y=60/x i dalej rozwiaz

(x+8)(y-1)=80 X×Y=60 x=60/y (60/y+8)(y-1)=80 60-60/y+8y-8=80 / to wszystko razy y 60y-60+8y²-8y=80y 8y²+60y-8y-80y-60=0 8y²-28y-60=0 Δ=784+1920=2704 √Δ=52 x₁=1,5 x₂=5 x ∈1,5 i 5