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**Comparing Tape Diagram Solutions to Algebraic Solutions**

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Vocabulary Coefficient: The number before the variable. It is multiplying the variable -Example: 4x + 7 = 31 Distributive Property: When multiplying a sum or difference, you can distribute the multiplication to both terms and multiply separately. coefficient

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Example

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Example

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On Your Own

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**I need you to break into 7 equal groups**

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Find the cost: A slice of pizza, 1 plane ticket, 2 nights in the motel, and 1 evening movie One t-shirt, 1 ticket to the baseball game, 1 day of the rental car

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When solving an equation with parentheses, order of operations must be followed. What property can be used to eliminate parentheses; for example, 3(𝑎 + 𝑏) = 3𝑎 + 3𝑏? Another approach to solving the problem is to eliminate the coefficient first. How would one go about eliminating the coefficient? How do we “undo” multiplication? What is the result when “undoing” multiplication in any problem? What mathematical property is being applied when “undoing” multiplication? What approach must be taken when solving for a variable in an equation and “undoing” addition is required?

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**What is the result when “undoing” addition in any problem?**

What mathematical property is being applied when “undoing” addition? What mathematical property allows us to perform an operation (or, “do the same thing”) on both sides of the equation? How are the addition and multiplication properties of equality applied?

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The cost of a babysitting service on a cruise is $10 for the first hour, and $12 for each additional hour. If the total cost of babysitting baby Aaron was $58, how many hours was Aaron at the sitter?

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How does modeling the sequence of operations with a tape diagram help to solve the same problem algebraically? What are the mathematical properties, and how are they used in finding the solution of a linear equation containing parenthesis?

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Exit Ticket 1. Jim’s father works two part-time jobs; one in the morning and one in the afternoon, and works a total of 48 hr. each 5-day work week. If his schedule is the same each day, and he works 4 hr. each morning, how many hours does Eric’s father work each afternoon?

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Solve each equation in your lecture notebook. Do Now 1)x – 5 = 21 2)m – ( - 8) = -11 State the property you used in each problem.

Solve each equation in your lecture notebook. Do Now 1)x – 5 = 21 2)m – ( - 8) = -11 State the property you used in each problem.

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