1 3 Algebraic Expressions Students will be able

1. 3 – Algebraic Expressions Students will be able to: • evaluate algebraic expressions • Simplify algebraic expressions Lesson Vocabulary • Evaluate • term • coefficient • Constant terms • Like terms

1. 3 – Algebraic Expressions Problem 1: Which algebraic expression models the word phrase seven fewer than a number t? a. t + 7 b. -7 t c. t – 7 d. 7 – t

1. 3 – Algebraic Expressions Problem 1 b: Which algebraic expression models the word phrase two times the sum of a and b? a. a + b b. a + 2 b c. 2 a + b d. 2(a + b)

1. 3 – Algebraic Expressions To model a situation with an algebraic expression, do the following: • Identify the actions that suggest operations • Define or more variables to represent the unknown(s). • Represent the actions using the variables and the operations.

1. 3 – Algebraic Expressions Problem 2: You start with $20 and save $6 each week. What algebraic expression models the total amount you save?

1. 3 – Algebraic Expressions Problem 2 b: You had $150, but you are spending $2 each day. What algebraic expression models this situation?

1. 3 – Algebraic Expressions To evaluate an algebraic expression, substitute a number for each variable in the expression. Then simplify using order of operations. Problem 3: What is the value of the expression for the given values of the variables? a. 7(a + 4) + 3 b – 8 for a = -4 and b = 5 b. for x = 1 and y = 1/2

1. 3 – Algebraic Expressions Problem 3 b: What is the value of the expression for the given values of the variables? a. for x = 6 and y = -3

1. 3 – Algebraic Expressions An expression that is a number, a variable, or the product of a number and one or more variables is a term. A coefficient is the numerical factor of a term. A constant term is a term with no variables. You can add terms to form longer expressions. The expression below has three terms. The constant term is -6 -4 ax +7 w – 6 The numerical coefficient of -4 ax is -4 The numerical coefficient of 7 w is 7

1. 3 – Algebraic Expressions Like terms have the same variables raised to the same powers.

1. 3 – Algebraic Expressions Problem 5: Combine like terms. What is a simpler form of each expression? a. b. c.

1. 3 – Algebraic Expressions Exit Slip: Explain the difference between a constant and a coefficient How are algebraic expressions and numerical expressions alike? How are the different? Include examples to justify your reasoning.