# Equations of Parallel and Perpendicular Lines Inquiry Activity

In Geometry Honors we do coordinate geometry throughout the school year.  Since we’re working on parallel lines, I also teach equations of parallel and perpendicular lines.  I totally changed the way I taught this lesson this year and it went great!  Since it went so well, I want to share what I did with you.

While I normally use guided notes, foldables, or flip books as notes for my students, it is important to me that my students learn how to take notes if they aren’t given a guide.  I explained to my students that their teachers may not always give them a powerpoint or a guide to take notes.  So, I made them take notes on a blank sheet of paper.  We reviewed the slope formula, the slope-intercept form of a line, and the point-slope form of a line.  I made up examples as I went along.  As we talked, I had students do a thumbs up or a thumbs down to show me what they remembered from Algebra 1.  This is what their notes looked like:

Then, I used these notes as an inquiry activity.  I passed them out to my students and told them to use the notes that they just took to help them.  I walked around while they were working with their partners, but I didn't even need to answer questions.  The way the activity is presented, all of my students were able to work through it without me at all.  I was so surprised!  One of my students even said, "Can we do notes like this every day?"  Um, sure!  Honey, if you will do work without complaint, we absolutely can.  I said, "We'll just have to see..."  This is a free download from TPT.  Get it.  I hope you love it too!

It was a block day, so I had a 75 minute class period.  Once they were finished with the notes, they worked on my Equations of Parallel and Perpendicular Lines Chain Activity.

I didn’t feel like using lots of colored paper, so I copied the two pages next to each other on the copier using the “2 Pages -> 1 Page” setting.  I don’t know what it’s called, but the copier at my school has this setting.  Once I copied them, on the colored paper, I cut them in half (so each page was the size of a half sheet of paper).

Then the kids worked the problems.  The problems and the answers fit together like dominoes into a chain.

My students did so well with this lesson that I just wanted to share.