Warm UpWrite an equation using point-slope form.

1. , and

2. and

2.4 Day 2

Writing Equations

Day 2

Horizontal

Vertical

Parallel

Perpendicular

Horizontal Lines

What do horizontal lines look like?

Do you have a trick/hint that helps you remember that?

Horizontal Lines

Graph the following points.

Find the slope.

Review Questions

Why do you think the slope?

Come up with two new points that will also give you a slope of zero!

Vertical Lines

What do vertical lines look like?

Do you have a trick/hint that helps you remember that?

Vertical Lines

Graph the following points.

Find the slope.

Review Questions

The calculator said error because we divided by zero.

Come up with two new points that would also cause a calculator error!

HOY VUXGraphing Horizontal and Vertical LinesEach student will be given a worksheet to overview horizontal and vertical lines.

Parallel vs. PerpendicularParallel same slope

Perpendicular opposite reciprocals

and

and

ExamplesDetermine whether the graphs of each pair of equations are parallel, perpendicular, or neither.1.

2.

ExamplesDetermine whether the graphs of each pair of equations are parallel, perpendicular, or neither.1.

2.

You Try!Determine whether the graphs of each pair of equations are parallel, perpendicular, or neither.

1.

2.

Review QuestionSummarize to a neighbor the rules about parallel and perpendicular.

Be prepared to share what your neighbor said.

Parallel vs. PerpendicularAre the lines L1 and L2 passing through the given pairs of points parallel, perpendicular, or neither?

1. L1: ; L2:

2. L1: ; L2:

3. L1: ; L2:

You Try!!!Are the lines L1 and L2 passing through the given pairs of points parallel, perpendicular, or neither?

L1: ;

L2:

Extra PracticeAre the lines L1 and L2 passing through the given pairs of points parallel, perpendicular, or neither?

1. L1: ; L2:

2. L1: ; L2:

Parallel vs. PerpendicularWrite an equation in slope-intercept form of the line…

Parallel to:

and goes through .

Perpendicular to:

and goes through .

ExamplesWrite the equation in slope-intercept form of the line for each equation that passes through the given point.

1. Parallel to through

2. Perpendicular to through

Homework

Lesson 2.4Pg. 86-87 #’s 6-7, 23-26