Linear Functions Test Review

The slope of a line is a measure of its steepness, calculated as the change in y divided by the change in x (rise/run).

Slope (m) = (y2 - y1) / (x2 - x1).

The y-intercept is the point where the line crosses the y-axis, represented as (0, b) in the equation y = mx + b.

In the equation y = kx, 'k' represents the constant of proportionality, indicating how y changes with x.

A horizontal line has a slope of zero.

A vertical line has an undefined slope.

A graph is proportional if it is a straight line that passes through the origin (0,0).

The equation of a line in slope-intercept form is y = mx + b, where m is the slope and b is the y-intercept.

Two lines are parallel if they have the same slope but different y-intercepts.

Two lines are perpendicular if the product of their slopes is -1.