Determine missing coordinates given points

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SWBAT determine missing coordinates given points.

Big Idea

You've found slope before, given two points. But what if I gave you one point and the slope? Could you find the other point?

Warm Up

10 minutes

Today's Warm Up task consists of a single problem that requires students to interpret a geometric figure in a graph, and, apply their understanding of slope. 

It is derived from EngageNY's materials on sample tasks related the 8th grade Common Core standards.  I like it because it can be solved using both the methods we learned in previous days, as well as similar triangles.  Kids generally stick to the method we use, but 1-2 kids per class can see the similar triangles work, especially when prompted.

Play of the Day

40 minutes


10 minutes


15 minutes

Homework 127 is to be completed at home and should take students approximately 15 minutes.