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# Unit 3: Linear equations and functions

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## About this unit

When distances, prices, or any other quantity in our world changes at a constant rate, we can use linear functions to model them. Let's learn how different representations, including graphs and equations, of these useful functions reveal characteristics of the situation.

### Learn

### Practice

- Rates & proportional relationshipsGet 5 of 7 questions to level up!
- Graphing proportional relationshipsGet 3 of 4 questions to level up!

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### Practice

- Solutions to 2-variable equationsGet 3 of 4 questions to level up!
- Complete solutions to 2-variable equationsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 320 Mastery points

### Learn

### Practice

- Intercepts from a graphGet 3 of 4 questions to level up!
- Intercepts from an equationGet 3 of 4 questions to level up!

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### Practice

- Slope from graphGet 3 of 4 questions to level up!
- Slope from two pointsGet 3 of 4 questions to level up!
- Slope from equationGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 400 Mastery points

### Learn

### Practice

- Slope-intercept equation from graphGet 3 of 4 questions to level up!
- Slope-intercept from two pointsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 320 Mastery points

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### Practice

- Evaluate functionsGet 3 of 4 questions to level up!
- Evaluate functions from their graphGet 3 of 4 questions to level up!
- Function rules from equationsGet 3 of 4 questions to level up!

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### Practice

- Linear equations word problems: graphsGet 3 of 4 questions to level up!
- Linear equations word problemsGet 3 of 4 questions to level up!
- Linear models word problemsGet 3 of 4 questions to level up!

### Learn

### Practice

- Compare linear functionsGet 3 of 4 questions to level up!
- Comparing linear functions word problemsGet 3 of 4 questions to level up!

### Learn

### Practice

- Graphing linear relationships word problemsGet 3 of 4 questions to level up!
- Writing linear functions word problemsGet 3 of 4 questions to level up!

### Learn

### Practice

- Recognize functions from tablesGet 3 of 4 questions to level up!
- Recognize functions from graphsGet 3 of 4 questions to level up!

### Learn

### Practice

- Linear & nonlinear functionsGet 5 of 7 questions to level up!
- Interpreting graphs of functionsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 1,120 Mastery points

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Level up on all the skills in this unit and collect up to 2,700 Mastery points!