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xy= -15 ⇒ y=-15/x , x, y ≠0
x-15/x=2 /*x
x²-2x-15=0
Δ=4+4*15=64
x=1/2*(2+8)=5, y=-3 lub x=1/2*(2-8)=-3, y=5
Odp. (x,y)=(5,-3) v (x,y)=(3,-5).
Zad. 2. w zalaczniku.