# 1-1 Variables and Expressions

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1 1-1 Variables and Expressions Warm Up Lesson Presentation Lesson Quiz

2 Warm Up Add or subtract (9) Multiply or divide (10)

3 Objectives Translate between words and algebra. Evaluate algebraic expressions.

4 variable constant Vocabulary numerical expression algebraic expression evaluate

5 A variable is a letter or a symbol used to represent a value that can change. A constant is a value that does not change. A numerical expression contains only constants and operations. An algebraic expression may contain variables, constants, and operations.

6 You will need to translate between algebraic expressions and words to be successful in math. + Plus, sum, increased by Minus, difference, less than Times, product, equal groups of Divided by, quotient

7 Writing Math These expressions all mean 2 times y : 2y 2(y) 2 y (2)(y) 2 x y (2)y

8 Example 1: Translating from Algebra to Words Give two ways to write each algebraic expression in words. A. 9 + r B. q 3 the sum of 9 and r 9 increased by r C. 7m D. j 6 the product of m and 7 m times 7 the difference of q and 3 3 less than q the quotient of j and 6 j divided by 6

9 Check It Out! Example 1 Give two ways to write each algebraic expression in words. 1a. 4 - n 1b. 4 decreased by n the quotient of t and 5 n less than 4 t divided by 5 1c. 9 + q 1d. 3(h) the sum of 9 and q the product of 3 and h q added to 9 3 times h

10 To translate words into algebraic expressions, look for words that indicate the action that is taking place. Add Put together, combine Subtract Find how much more or less Multiply Put together equal groups Divide Separate into equal groups

11 Example 2A: Translating from Words to Algebra John types 62 words per minute. Write an expression for the number of words he types in m minutes. m represents the number of minutes that John types. 62 m or 62m Think: m groups of 62 words

12 Example 2B: Translating from Words to Algebra Roberto is 4 years older than Emily, who is y years old. Write an expression for Roberto s age y represents Emily s age. y + 4 Think: older than means greater than.

13 Example 2C: Translating from Words to Algebra Joey earns \$5 for each car he washes. Write an expression for the number of cars Joey must wash to earn d dollars. d represents the total amount that Joey will earn. Think: How many groups of \$5 are in d?

14 Check It Out! Example 2a Lou drives at 65 mi/h. Write an expression for the number of miles that Lou drives in t hours. t represents the number of hours that Lou drives. 65t Think: number of hours times rate per hour.

15 Check It Out! Example 2b Miriam is 5 cm taller than her sister, than her sister who is m centimeters tall. Write an expression for Miriam s height in centimeters. m represents Miriam s sister's height in centimeters. m + 5 Think: Miriam's height is 5 added to her sister's height.

16 Check It Out! Example 2c Elaine earns \$32 per day. Write an expression for the amount she earns in d days. d represents the amount of money Elaine will earn each day. 32d Think: The number of days times the amount Elaine would earn each day.

17 To evaluate an expression is to find its value. To evaluate an algebraic expression, substitute numbers for the variables in the expression and then simplify the expression.

18 Example 3: Evaluating Algebraic Expressions Evaluate each expression for a = 4, b =7, and c = 2. A. b c b c = 7 2 Substitute 7 for b and 2 for c. = 5 Simplify. B. ac ac = 4 2 = 8 Substitute 4 for a and 2 for c. Simplify.

19 Evaluate each expression for m = 3, n = 2, and p = 9. a. mn mn = 3 2 = 6 b. p n p n = 9 2 = 7 c. p m p m = 9 3 = 3 Check It Out! Example 3 Substitute 3 for m and 2 for n. Simplify. Substitute 9 for p and 2 for n. Simplify. Substitute 9 for p and 3 for m. Simplify.

20 Example 4A: Recycling Application Approximately eighty-five 20-ounce plastic bottles must be recycled to produce the fiberfill for a sleeping bag. Write an expression for the number of bottles needed to make s sleeping bags. The expression 85s models the number of bottles to make s sleeping bags.

21 Example 4B: Recycling Application Continued Approximately eighty-five 20-ounce plastic bottles must be recycled to produce the fiberfill for a sleeping bag. Find the number of bottles needed to make 20, 50, and 325 sleeping bags. Evaluate 85s for s = 20, 50, and 325. s s 85(20) = (50) = (325) = 27,625 To make 20 sleeping bags, 1700 bottles are needed. To make 50 sleeping bags, 4250 bottles are needed. To make 325 sleeping bags, 27,625 bottles are needed.

22 Writing Math A replacement set is a set of numbers that can be substituted for a variable. The replacement set in Example 4 is (20, 50, and 325).

23 Check It Out! Example 4a To make one sweater, 63 twenty ounce plastic drink bottles must be recycled. Write an expression for the number of bottles needed to make s sweaters. The expression 63s models the number of bottles to make s sweaters.

24 Check It Out! Example 4b Continued To make one sweater, 63 twenty ounce plastic drink bottles must be recycled. Find the number of bottles needed to make 12, 25 and 50 sweaters. Evaluate 63s for s = 12, 25, and 50. s s 63(12) = (25) = (50) = 3150 To make 12 sweaters, 756 bottles are needed. To make 25 sweaters, 1575 bottles are needed. To make 50 sweaters, 3150 bottles are needed.

25 Lesson Quiz: Part I Give two ways to write each algebraic expression in words. 1. j 3 The difference of j and 3; 3 less than j. 2. 4p 4 times p; The product of 4 and p. 3. Mark is 5 years older than Juan, who is y years old. Write an expression for Mark s age. y + 5

26 Evaluate each expression for c = 6, d = 5, and e = 10. d c + d e 2 Shemika practices basketball for 2 hours each day. Lesson Quiz: Part II 6. Write an expression for the number of hours she practices in d days. 2d 7. Find the number of hours she practices in 5, 12, and 20 days hours; 24 hours; 40 hours

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