PA Vocabulary Proportional and Non Proportional Functions

Front

Constant of Proportionality

Back

k in the equation y = kx, where k is the slope.

Front

Direct Variation

Back

A linear relationship where y/x=k consistently, and the linear equation is y = kx.

Front

Linear Relationship

Back

A relationship with a constant rate of change represented by a graph that forms a straight line.

Front

Y-Intercept

Back

Y-coordinate of a point at which the relationship crosses the y-axis meaning the x-coordinate is equal to zero, denoted as b in y = mx + b.

Front

Unit Rate

Back

A ratio between two different units where one of the terms is 1.

Front

Non-Proportional

Back

The relationship between two ratios with a rate or ratio that is not constant (not equal ratios).

Front

Slope

Back

Rate of change in y (vertical) compared to the rate of change in x (horizontal), denoted as m in y = mx + b, or as k in y=kx. rise/run.

Front

Proportional

Back

The relationship between two ratios with a rate or ratio that is the same.

Front

Origin

Back

(0,0)

Front

Function

Back

A relation in which each input (x) has exactly one output (y). No x value repeats.