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10 cards from this deck
'is proportional to'
Quantities increase/decrease together at same rate
y=kxy = kxy=kx where kkk is constant
Straight line through origin (0,0)
One increases while other decreases, product constant
y=kxy = \frac{k}{x}y=xk where kkk is constant
Curved line (reciprocal graph)
y∝xy \propto xy∝x
y∝1xy \propto \frac{1}{x}y∝x1
Opposite directions
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