Proportional Relationships - relationships between two quantities where the ratio between the two quantities remains constant., Non-Proportional Relationships - relationships between two quantities where the ratio between the two quantities is not constant., Constant of Proportionality - value of the ratio of two quantities x and y are found by the equation k= y/x, Unit Rate - Slope or constant of proportionality, y=mx + b: Letter b represents - y-intercept, y=mx + b: Letter m represents - slope, Point (0,0) - origin,

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