About This Lesson
<p>Can you decide whether two lines are perpendicular or not? Can you do this without drawing them?</p>Aligned to Common Core State Standard: 8.EE.6
Subject
Math — Expressions and Equations
Grade Level
Grades 6-8
Resource Type
Activity
Standards Alignment
Common Core State Standards
License
Resources
Files
Dotty_grids[1].doc
External resources
Standards
Use similar triangles to explain why the slope ? is the same between any two distinct points on a non-vertical line in the coordinate plane; derive the equation ? = ?? for a line through the origin and the equation ? = ?? + ? for a line intercepting the vertical axis at ?.
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Nice resource for connecting tilted squares to slopes of perpendicular lines.