## Reflection: Checks for Understanding Line It Up! - Section 3: Practice and Review of Writing Equations

One easy way to allow students to check their work in these questions on determining if lines are parallel, perpendicular or neither is to ask students to graph each pair of lines using their calculator.  In today's class notes, you can see that I specifically put in clip art of a Graphing Calculator to remind students that they should be using this tool.  Moreover, this further reinforces students' prior knowledge of parallel and perpendicular lines by asking them to identify how and if lines look parallel or perpendicular.  By visually checking their answers, you can remind students that graphing the lines helps to check the relationship of the lines but does NOT prove the lines are parallel, perpendicular or neither!

It's important to also remind students that they must first solve for y before graphing any equations in their calculator!

By utilizing a graphing calculator in this lesson, students are working towards mastery of mathematical practice 5, where they are asked to use tools strategically.  I find that when we integrate tools, like the graphing calculator, into the curriculum on a regular basis, students are more apt to look on this as a tool for checking their work and also solving a host of problems, not just in the types of problems presented in class.

Checks for Understanding: Using Graphing Calculators

# Line It Up!

Unit 2: Line-sanity!
Lesson 6 of 9

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

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90 minutes

### Stephanie Conklin

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