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describes how one quantity changes in relation to another
rate of change

A proportion is an equation stating that two ratios are:
of different units

Two ratios that have the same value are called:
equivalent ratios

rate of change between any two points on a line
slope

to determine whether two ratios form a proportion, you can find their:
cross products

ratio of the model measure to the actual measure
rate

either of the two products obtained by multiplying together the two means or the two extremes of a proportion
cross product

drawing that shows a real object with accurate sizes except they have all been reduced or enlarged by a certain amount
scale drawing

