Direct and inverse proportional relationships

Direct proportionality: as one quantity grows, the other grows by the same factor (

y=k\cdot x

with constant

k

). Inverse proportionality: the product of the two quantities stays constant (

x\cdot y=k

): if you increase one, the other decreases so the product stays the same.

Direct: the same multiplier

k

from

x

y

Inverse: constant product

x\cdot y

From a table you can check the type of relationship and find a missing value

Direct proportionality

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