GeoGebra: Parallel Lines in the Coordinate Plane - Quick Exploration
GeoGebra

From what you’ve observed, what can we conclude about any two (non-vertical) lines drawn in the coordinate plane?

GeoGebra: Perpendicular Lines in the Coordinate Plane - Quick Exploration
GeoGebra

What does it mean for lines to be perpendicular (by definition)?

GeoGebra: Meet Slope - IM 8.2.10
GeoGebra

“Meet Slope” from IM Grade 8 by Open Up Resources and Illustrative Mathematics.

GeoGebra: Writing Equations for Lines - IM 8.2.11
GeoGebra

“Writing Equations for Lines” from IM Grade 8 by Open Up Resources and Illustrative Mathematics.

GeoGebra: Using Equations for Lines - IM 8.2.12
GeoGebra

“Using Equations for Lines” from IM Grade 8 by Open Up Resources and Illustrative Mathematics.

GeoGebra: Slopes Don't Have to be Positive IM 8.3.9
GeoGebra

“Slopes Don’t Have to be Positive” from IM Grade 8 by Open Up Resources and Illustrative Mathematics.

GeoGebra: Equations of All Kinds of Lines IM 8.3.11
GeoGebra

“Equations of All Kinds of Lines” from IM Grade 8 by Open Up Resources and Illustrative Mathematics.

GeoGebra: Calculating Slope IM 8.3.10
GeoGebra

“Calculating Slope” from IM Grade 8 by Open Up Resources and Illustrative Mathematics.

GeoGebra: Solutions to Linear Equations IM 8.3.12
GeoGebra

“Solutions to Linear Equations” from IM Grade 8 by Open Up Resources and Illustrative Mathematics.

GeoGebra: Using Linear Relations to Solve Problems IM 8.3.14
GeoGebra

“Using Linear Relations to Solve Problems” from IM Grade 8 by Open Up Resources and Illustrative Mathematics.

GeoGebra: More Solutions to Linear Equations IM 8.3.13
GeoGebra

“More Solutions to Linear Equations” from IM Grade 8 by Open Up Resources and Illustrative Mathematics.

GeoGebra: Translating to y = mx + b IM 8.3.8
GeoGebra

“Translating to y = mx + b” from IM Grade 8 by Open Up Resources and Illustrative Mathematics.