Direct proportion, linear, first-order... all of these are valid answers, depending on the particular field you're talking about.
In Direct Proportion
It is the constant of proportionality.
Direct proportionality. Their graph would be a straight line through the origin, with the slope equal to the ratio.
Graphical: If two variables are proportional, the graph of one of the variables against the other is a straight line through the origin.Algebraic: If the ratio of the two variables is a constant.
It is the constant of proportionality or the conversion factor.
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).
Direct Proportion
Two variables whose ratio is constant have a linear relationship. The first variable is the second multiplied by the constant.
It is a direct proportion.
dependent
If two variables are in direct relationship then the ratio of the two variables is known as the constant of proportion between them. In algebraic form, if X and Y are the two variables, then direct proportionality implies that Y = cX and c is the constant of proportionality.
It is the constant of proportionality.
It is the constant of proportionality.
Direct proportionality. Their graph would be a straight line through the origin, with the slope equal to the ratio.
Graphical: If two variables are proportional, the graph of one of the variables against the other is a straight line through the origin.Algebraic: If the ratio of the two variables is a constant.
The constant of proportionality between two variables is the ratio of one to the other.
It is the constant of proportionality or the conversion factor.
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).