# Algebra

Parent topic:
Mathematics
• ### Parallel Lines in the Coordinate Plane: Quick Exploration

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GeoGebra Team

• ### Perpendicular Lines in the Coordinate Plane: Quick Exploration

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GeoGebra Team

• ### Exploring Intersections of Planes

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GeoGebra Team

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Steve Phelps

• ### Mystery Scalar and Vectors Investigation

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Tim Brzezinski

• ### Introducing Proportional Relationships with Tables: IM 7.2.2

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GeoGebra Classroom Activities

• ### More about Constant of Proportionality: IM 7.2.3

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GeoGebra Classroom Activities

• ### Proportional Relationships and Equations: IM 7.2.4

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GeoGebra Classroom Activities

• ### Two Equations for Each Relationship: IM 7.2.5

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GeoGebra Classroom Activities

• ### Using Equations to Solve Problems: IM 7.2.6

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GeoGebra Classroom Activities

• ### Comparing Relationships with Tables: IM 7.2.7

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GeoGebra Classroom Activities

• ### Solving Problems about Proportional Relationships: IM 7.2.9

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GeoGebra Classroom Activities

• ### Using Graphs to Compare Relationships: IM 7.2.12

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GeoGebra Classroom Activities

• ### Meet Slope: IM 8.2.10

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GeoGebra Classroom Activities

• ### Using Water Efficiently: IM 7.2.15

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GeoGebra Classroom Activities

• ### Writing Equations for Lines: IM 8.2.11

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GeoGebra Classroom Activities

• ### Lots of Flags: IM 7.4.1

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GeoGebra Classroom Activities

• ### Using Equations for Lines: IM 8.2.12

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GeoGebra Classroom Activities

• ### Revisiting Proportional Relationships: IM 7.4.3

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GeoGebra Classroom Activities

• ### One Hundred Percent: IM 7.4.7

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GeoGebra Classroom Activities

• ### Percent Error: IM 7.4.14

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GeoGebra Classroom Activities

• ### More and Less than 1%: IM 7.4.9

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GeoGebra Classroom Activities

• ### Tax and Tip: IM 7.4.10

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GeoGebra Classroom Activities

• ### Relationships between Quantities: IM 7.6.1

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GeoGebra Classroom Activities