# Line It Up!

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## Objective

SWBAT write equations of lines that are parallel and perpendicular given slopes and points. SWBAT construct parallel and perpendicular lines.

#### Big Idea

In this student-centered lesson, students work together to construct parallel and perpendicular lines while also writing equations for these lines.

## Do Now

10 minutes

Students will find the slope of a line given 2 points.  This is a pre-requisite skill but may require review for students, particularly the slope formula.

25 minutes

## Practice and Review of Writing Equations

25 minutes

After reviewing parallel and perpendicular lines, we will review with students how to write equations in slope-intercept form and point-slope form.  Then, you can focus on how to write parallel and perpendicular lines with given information like an equation and a point (MP #8).

The topic covered in this section are a review of CCSS in Algebra and you may find that students with weaker backgrounds need a more concrete review of this topic.  The next lesson in this curriculum, Perp Lines are Perfect!, will continue to review writing equations.

Students Notes - Line It Up!

## Construction

10 minutes

Students will read through the steps to construct a parallel line through a given point, and can watch the video of this being constructed (MP 5).  I like to watch the entire video first, read through the steps to construction, and then go through the construction step by step with the whole class.  There is a second practice example provided for students to try on their own.

Student Notes - Line It Up!

## Activity/Homework and Exit Ticket

20 minutes

This is a packed lesson and there may not be time for students to complete the activity; in this case the class work can be assigned as homework.

For the exit ticket, students will write the equation of a line perpendicular to a given line and through a given point.  This may be a good exit ticket to collect to see how and if students have strong algebra skills or if this topic needs further reinforcement.