WARM UP

EVALUATING EXPRESSIONS Evaluate the expression for the given value of the variable. (Lesson 1.1)

1. (8)(x) when x = 42. 24/x when x = 33. x + 15 when x = 124. 9x when x = 75. 25 – x when x = 14

4

WARM UP

EVALUATING EXPRESSIONS Evaluate the expression for the given value of the variable. (Lesson 1.1)

1. (8)(x) when x = 42. 24/x when x = 33. x + 15 when x = 124. 9x when x = 75. 25 – x when x = 14

3

WARM UP

EVALUATING EXPRESSIONS Evaluate the expression for the given value of the variable. (Lesson 1.1)

1. (8)(x) when x = 42. 24/x when x = 33. x + 15 when x = 124. 9x when x = 75. 25 – x when x = 14

2

WARM UP

EVALUATING EXPRESSIONS Evaluate the expression for the given value of the variable. (Lesson 1.1)

1. (8)(x) when x = 42. 24/x when x = 33. x + 15 when x = 124. 9x when x = 75. 25 – x when x = 14

1

EVALUATING EXPRESSIONS Evaluate the expression for the given value of the variable. (Lesson 1.1)

1. (8)(x) when x = 42. 24/x when x = 33. x + 15 when x = 124. 9x when x = 75. 25 – x when x = 14

WARM UP 0

1.5 Translating Words into Mathematical Symbols

GOAL: Translate words into mathematical symbols.KEY WORDS: •Translate•Phrase•sentence

EXAMPLE 1: Translate Addition PhrasesWrite the phrase as a variable expression. Let x represent the number.PHRASE CONCLUSIONThe sum of 6 and a number8 more than a numberA number plus 5A number increased by 7

1.5 Translating Words into Mathematical Symbols

6 + xx + 8x + 5x + 7

EXAMPLE 2: Translate Subtraction PhrasesWrite the phrase as a variable expression. Let x represent the number.PHRASE CONCLUSIONThe difference between 5 and a number7 minus a numberA number decreased by 94 less than a number

1.5 Translating Words into Mathematical Symbols

5 – x7 – xx – 9x - 4

EXAMPLE 3: Translate Multiplication and Division PhrasesWrite the phrase as a variable expression. Let x represent the number.PHRASE CONCLUSIONThe product of 9 and a number10 times a numberA number multiplied by 3One fifth of a numberThe quotient of a number and 67 divided by a number

1.5 Translating Words into Mathematical Symbols

9x10x3x⅕xx/67/x

EXAMPLE 4: Translate SentencesWrite the sentence as an equation or inequality.PHRASE CONCLUSIONThe sum of a number x and 12 is 16.

The quotient of 15 and a number xIs less than 3.

1.5 Translating Words into Mathematical Symbols

x + 12 = 16

15/x < 3

EXAMPLE 5: Write and Solve an Equationa. Translate into mathematical symbols: “ The difference between 13 and a number

is 7” Let x represent the number.b. Use mental math to solve the equation.Solutionc. The equation is 13 – x = 7

d. Using mental math, you can find that the solution is x = 6

1.5 Translating Words into Mathematical Symbols

1.5 Translating Words into Mathematical Symbols

CHECKPOINT

Write the phrase as a variable expression. Let x represent the number.

1. 11 more than a number

2. A number decreased by 10

3. The quotient of 8 and a number

4. The product of 2 and a number

5. The product of 5 and a number x is 25

6. 10 times a number x is greater than or equal to 50