Post on 24-Dec-2015
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