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10 cards from this deck
As one quantity increases, the other decreases proportionally
y=kxy = \frac{k}{x}y=xk where kkk is constant
Constant of variation (a fixed number)
xy=kxy = kxy=k
As xxx increases, yyy decreases proportionally
Less time
kkk (the constant)
Find kkk by substituting known values
One increases → other decreases
Write the equation y=kxy = \frac{k}{x}y=xk
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