1-3 Variables and Algebraic Expressions. Warm Up Problem of the Day Lesson Presentation Lesson Quizzes
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1 Warm Up Problem of the Day Lesson Presentation Lesson Quizzes
2 Warm Up Evaluate. 1. 5(7) (18 11) (40 35) (12 4)
3 Problem of the Day If charged per cut, how much will it cost to cut a log into eight pieces if cutting it into four pieces costs $12?
4 Learn to evaluate algebraic expressions.
5 Vocabulary variable constant algebraic expression evaluate
6 Harrison Ford was born in You can find out what year Harrison turned 18 by adding the year he was born to his age In algebra, letters are often used to represent numbers. You can use a letter such as a to represent Harrison Ford s age. When he turns a years old, the year will be a.
7 The letter a has a value that can change, or vary. When a letter represents a number that can vary, it is called a variable. The year 1954 is a constant because the number cannot change. An algebraic expression consists of one or more variables. It usually contains constants and operations. For example, a is an algebraic expression for the year Ron Howard turns a certain age.
8 Age Year born + age = year at age a a To evaluate an algebraic expression, substitute a number for the variable.
9 Additional Example 1: Evaluating Algebraic Expressions Evaluate k + 9 for each value of k. A. k = 5 k Substitute 5 for k. Add. B. k = 2 k Substitute 2 for k. 11 Add.
10 Check It Out: Example 1 Evaluate a + 6 for each value of a. A. a = 3 a Substitute 3 for a. Add. B. a = 5 a Substitute 5 for a. 11 Add.
11 Multiplication and division of variables can be written in several ways, as shown in the table. When evaluating expressions, use the order of operations.
12 Additional Example 2: Evaluating Algebraic Expressions Involving Order of Operations Evaluate the expression for the given value of the variable. A. 4x 3 for x = 2 4(2) Substitute 2 for x. Multiply. Subtract.
13 Additional Example 2: Evaluating Algebraic Expressions Involving Order of Operations B. s 5 + s, for s = C. 5x 2 + 3x, for x = 2 5(2) 2 + 3(2) 5(4) + 3(2) Substitute 15 for s. Divide. Add. Substitute 2 for x. Evaluate the power. Multiply. Add.
14 Check It Out: Example 2A Evaluate the expression for the given value of the variable. A. 3x 2 for x = 3 3(3) Substitute 3 for x. Multiply. Subtract.
15 Check It Out: Example 2 B. r 3 + r, for r = C. 4y 2 + 2y, for y = 3 4(3) 2 + 2(3) 4(9) + 2(3) Substitute 12 for r. Divide. Add. Substitute 3 for y. Evaluate the power. Multiply. Add.
16 Additional Example 3: Evaluating Algebraic Expressions with Two Variables Evaluate 6 a + 4b, for a = 3 and b = 2. 6 a + 4b (2) Substitute 3 for a and 2 for b. Divide and multiply from left to right. Add.
17 Check It Out: Example 3 Evaluate 8 w + 2x, for w = 4 and x = 2. 8 w + 2x (2) Substitute 4 for w and 2 for x. Divide and multiply from left to right. Add.
18 Lesson Quizzes Standard Lesson Quiz Lesson Quiz for Student Response Systems
19 Lesson Quiz Evaluate n + 7 for each value of n. 1. n = n =31 Evaluate each algebraic expression for the given value of the variables 3. 6y 5 for y = x 2 + 3x for x = y for x = 4 and y = 3 x 6. The expression 7d gives the number of days in d weeks. Evaluate 7d for d = 12. How many days are in 12 weeks?
20 Lesson Quiz for Student Response Systems 1. Evaluate m + 4 for m = 19. A. 21 B. 27 C. 23 D. 28
21 Lesson Quiz for Student Response Systems 2. Evaluate 7x 8 for x = 5. A. 20 B. 27 C. 22 D. 32
22 Lesson Quiz for Student Response Systems 3. Evaluate 6x 2 + 5x for x = 5. A. 185 B. 85 C. 175 D. 50
23 Lesson Quiz for Student Response Systems Evaluate y + 5y for x = 3 and y = 5. A. 38 B. 44 C. 54 D. 64
24 Lesson Quiz for Student Response Systems 5. The expression 12n gives the number of months in n years. Evaluate 12n for n = 3. How many months are in 3 years? A. 12 months B. 24 months C. 36 months D. 48 months
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