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Direct variation.
[Directly] proportional quantities.
Proportional
The diameter and circumference of a circle.
Unbalanced relation,
Direct variation.
The relationship is a linear one. For example when driving at a constant speed, the relationship between distance driven and the time driven is linear with a constant ratio (of the constant speed).
Two variables whose ratio is constant have a linear relationship. The first variable is the second multiplied by the constant.
It is a direct [linear] proportionality.
It is a direct proportion.
A linear relationship
It is called direct variation.
It is called direct variation.
[Directly] proportional quantities.
The constant of variation in a direct variation is the constant (unchanged) ratio of two variable quantities. The formula for direct variation is. y=kx (or y=kx ) where k is the constant of variation .
Proportional
Proportional