A rate.
That is known as a unit rate.
A rate is a ratio of two quantities: miles per hour, calories per cookie, dollars per person, ... a unit rate just specifies the units (miles, hours) of the two 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 .
A ratio uses division to compare two quantities.
The answer is proportional.
Rate
The diameter and circumference of a circle.
A rate.
Two quantities are said to be proportional if they vary in such a way that one of the quantities is a constant multiple of the other, or equivalently if they have a constant ratio.
It is a direct proportion.
A rate.
A rate.
Direct variation.
Rate
They have a constant rate or ratio.
A proportional relationship between two quantities is one in which the two quantities called the unit rate, the rate of change, or the constant of proportionality.