1: k=xy=-18
2: Khi x=-1 thì \(y=\dfrac{k}{x}=\dfrac{-18}{-1}=18\)
Khi x=2 thì \(y=\dfrac{-18}{2}=-9\)
Khi x=-3 thì \(y=\dfrac{-18}{-3}=6\)
Khi x=6 thì \(y=\dfrac{-18}{6}=-3\)
Khi x=-3/4 thì \(y=-18:\dfrac{-3}{4}=24\)
3: Khi y=1 thì \(x=\dfrac{-18}{1}=-18\)
Khi y=-2 thì \(x=\dfrac{-18}{-2}=9\)
Khi y=-6 thì \(x=\dfrac{-18}{-6}=3\)