joint variation

Variation / Proportional

Direct Variation / Directly Proportional

y is directly proportional to x, yx:
 
$y = kx$

k = constant of proportionality
y varies directly as x is another statement equivalent to the above statement.

 

Inverse Variation / Directly Proportional

y is inversely proportional to x, y ∝ 1/x:
 
$y = \dfrac{k}{x}$

k = constant of proportionality

 
 
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