E



E

|Constant |Variable |

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|Similarities: |Similarities |

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|Differences |Differences |

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|These are constants. |These are variables. |

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|Numerical Expression |Algebraic Expression |

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|Similarities: |Similarities |

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|Differences |Differences |

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|These are numerical expressions. |These are algebraic expression. |

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Ex: Re-write the word problem into an algebraic expression.

1. Roberto is 4 years older than Emily, who is y years old. Write an expression for Roberto’s age

2. John types 62 words per minute. Write an expression for the number of words he types in m minutes.

3. Joey earns $5 for each car he washes. Write an expression for the number of cars Joey must wash to earn d dollars.

You will need to be able to plug numbers into variables

• “equal sign” (in terms of variables)-

Ex:

Ex: Evaluate each expression for a = 4, b =7, c = 2, p = 8, and m = 4

1. [pic] 2. [pic]

3. [pic] 4. [pic]

5.

6. 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.

How many bottles will it take to make:

a. 20 sleeping bags b. 50 sleeping bags

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Questions?/Don’t Forgets

Main Ideas/Summary

8/29-8/30

Variables, Translating, & Evaluating Expressions

• VARIABLE

• CONSTANT

• NUMERICAL EXPRESSION

• ALGEBRAIC EXPRESSION

• EVALUATE

You must be able to translate these mathematical symbols into words

|[pic] |- |

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|[pic] |[pic] |

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Ex: Give two ways to write the algebraic expression in words.

1. 9 + r 2. q – 3 3. 7m

4. j ( 6 5. [pic] 6. [pic]

You must also be able to translate words back into mathematical symbols

|Add |Subtract |

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|Multiply |Divide |

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Ex: Re-write the word problem into an algebraic expression.

1. Roberto is 4 years older than Emily, who is y years old. Write an expression for Roberto’s age

2. John types 62 words per minute. Write an expression for the number of words he types in m minutes.

3. Joey earns $5 for each car he washes. Write an expression for the number of cars Joey must wash to earn d dollars.

You will need to be able to plug numbers into variables

• “equal sign” (in terms of variables)-

Ex:

Ex: Evaluate each expression for a = 4, b =7, c = 2, p = 8, and m = 4

1. [pic] 2. [pic]

3. [pic] 4. [pic]

5.

6. 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.

How many bottles will it take to make:

a. 20 sleeping bags b. 50 sleeping bags

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