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10 cards from this deck
One quantity depends on another, both change at same rate
Both quantities change in same direction (increase or decrease)
Constant - stays the same
Straight line passing through the origin (0,0)
kkk
The rate at which quantities change together (multiplier)
y=kxy = kxy=kx
k=yxk = \frac{y}{x}k=xy
yyy (quantity that depends on the other)
When one quantity is zero, the other must also be zero
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