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10 cards from this deck
One variable increases as other decreases
y=kxy = \frac{k}{x}y=xk
y∝1xy \propto \frac{1}{x}y∝x1
Constant of variation
xy=kxy = kxy=k (constant)
Hyperbola (curved shape)
Straight line
Check if xyxyxy is constant for all data pairs
As xxx increases, yyy decreases
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