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### Course: Algebra (all content) > Unit 5

Lesson 2: Introduction to systems of equations- Systems of equations: trolls, tolls (1 of 2)
- Testing a solution to a system of equations
- Solutions of systems of equations
- Systems of equations: trolls, tolls (2 of 2)
- Systems of equations with graphing: y=7/5x-5 & y=3/5x-1
- Systems of equations with graphing: exact & approximate solutions
- Systems of equations with graphing

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# Systems of equations: trolls, tolls (1 of 2)

A troll forces us to use algebra to figure out the make-up of his currency. We end up setting up a system of equations. Created by Sal Khan.

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