Function

Each input has one output

Relation

a set of ordered pairs

Linear

graph of the equation makes a straight line

Nonlinear

graph of the equation does NOT make a straight line

y-intercept

where the graph crosses the y-axis

slope

steepness of the line

slope of a graph

found using rise/run

proportional

two equal ratios

proportional on a graph

must be a straight line and cross through the origin (0,0)

Slope-Intercept Form

y = mx + b

Vertical Line Test

The test that is performed to check to see if a graph is a function.

Constant of Proportionality

"k" value in y = kx

Finding the Constant of Proportionality

Use y/x

Standard Form

ax + by = c

Rate of Change

the same as slope, Unit Rate, "m"

Slope of 2 Points

(y-y)/(x-x)