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parabola
If they increase or decrease exactly, then the constant of proportionality or coefficient of proportionality. If not exactly, then a correlation coefficient.
Function
inequality
line graphs
The two quantities are porportional.
Direct variation
The relations between quantities are stated by multiplicative relationship between the quantities.
direct variation or positive correlation.
It is a positive relationship.
an equation that expresses a relationship between two or more quantities
A ratio shows the relationship between two quantities.Formula
Variation in direct proportion.
If the slope of the trend line between variables X and Y is m, then an increase in value of 1 unit in X is associated with an increase of m units in the value of Y. The relationship is one of association, not of cause-and-effect.
It is a ratio
Function
It is a non-linear or non-existent relationship between the two quantities.