CHAPTER 3: PARALLEL AND PERPENDICULAR LINES

MISSY MCCARTHY OKEMOS HIGH SCHOOL MATH INSTRUCTOR

SECTION 3-6: LINES IN THE COORDINATE PLANE

I CAN• Graph lines and write the

equations of lines in both slope-intercept and point-slope form given a point and the slope or given two points.

• Classify lines as parallel, intersecting, or coinciding.

• Write the equations of horizontal and vertical lines.

EQUATIONS OF A LINE

Point Slope Form

EQUATIONS OF A LINE

Slope-Intercept Form

EQUATIONS OF A LINE

Vertical and Horizontal Lines

EXAMPLE

EXAMPLE

GRAPHING LINESYou can also use the equations to graph lines.

1) Plot the given point.

2) Use the slope to find other points on the line.

3) Extend the line and add arrows to the ends.

EXAMPLE

EXAMPLE

EXAMPLE

PAIRS OF LINES

EXAMPLE