2.4 Lines

Slope

Find the slope of the line passing through the given points.

Slope

(+) Slope

(-) Slope

Zero Slope

No Slope

Graphing Linear Equations

Graph a line given a point and the slope

General Form

• X and Y must be on the same side

• A and B may not contain any fractions

• A must always be positive

Point slope

Find the equation of a line in general form given a point and a

slope.

Find the equation of a line in general form given two points.

Point slope

Slope – Intercept

Find the slope and y-intercept of each equation and graph.

2.5 Parallel and Perpendicular

Lines

Parallel LinesTwo non-vertical lines are parallel if and only if their slopes are equal and they

have different y-intercepts.

Two non-vertical lines are perpendicular if and only

if the product of their slopes is – 1.

Perpendicular Lines

Determine if the lines are parallel, perpendicular, or

neither.