Activity Database

Search
Activity Authors
Activity Circles
Click To Sort By
Grade
Audience
  • 1st - 2nd (12)
  • 3rd - 5th (30)
  • 6th - 8th (83)
  • 9th - 12th (85)
  • College Level (72)
  • For Teachers (81)
Topics
Topics
  • Mathematical Modeling (15)
  • Number Theory (25)
  • Parity / Invariants (2)
  • Problem Solving / General (39)
  • Probability and Statistics (3)
  • Social Justice Mathematics (5)
  • Algebra / Arithmetic (33)
  • Combinatorics (31)
  • Geometry (36)
  • Mathematical Games (26)
Supporting Materials
Supporting Materials
  • Facilitator Guides (88)
  • Handouts (38)
  • Lesson Plan (10)
  • Photos & Videos (28)
  • References (36)
  • Virtual Tools (17)
Session Styles
Session Styles
  • Manipulatives (33)
  • Multiple Representations (33)
  • Problem Posing (45)
  • Problem Sets (51)
  • Try a Smaller Problem (40)
  • Work Backwards (21)
  • Integrates Technology (17)
  • Kinesthetic Element (11)
Mathematical Practices
Mathematical Practices
  • MP1 - Make sense of problems and persevere in solving them. (83)
  • MP2 - Reason abstractly and quantitatively. (53)
  • MP3 - Construct viable arguments and critique others' reasoning. (58)
  • MP4 - Model with mathematics. (58)
  • MP5 - Use appropriate tools strategically. (40)
  • MP6 - Attend to precision. (40)
  • MP7 - Look for and make use of structure. (72)
  • MP8 - Look for and express regularity in repeated reasoning. (61)

Systems of Linear Equations

By:


Developed as part of the Math Circles of Inquiry project, this short module explores a graphical solution to a system of equations. Students answer questions about lemonade sales and physically stand on the coordinates of a giant grid in order to see that plotting two equations on the same set of axes can give useful information. They will also gain experience in linear equation formats other than slope-intercept form and explore what the intersection points of the lines in a system of equations means.