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13 cards from this deck
Is proportional to
Variables increase/decrease together at same rate
y=kxy = kxy=kx (where kkk is constant)
Straight line through origin (0,0)
One variable increases as other decreases
y=kxy = \frac{k}{x}y=xk (where kkk is constant)
Hyperbola (curved shape)
Doubles too
Halves
y=kx2y = kx^2y=kx2
y=kx2y = \frac{k}{x^2}y=x2k
Convert to proportionality statement using ∝\propto∝
Replace ∝\propto∝ with =k= k=k
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