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Proportions are equivalent ratios.
If two things are increasing by the same rate, they are proportional.
3 characteristics of a proportional relationship:
ratios are equivalent: 1/2 = 4/8 = 6/12
graph goes through the origin [(0,0) must be part of the data]
equation does not have a constant: y=2x NOT y=2x+3 (the +3 makes it non proportional)
solving proportions.pdf
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If two things are increasing by the same rate, they are proportional.
3 characteristics of a proportional relationship: