1.1 Variables and Expressions.notebook · 2014-09-04 · 1.1 Variables and Expressions.notebook...

1.1 Variables and Expressions.notebook September 04, 2014

WARM UP


-Learning Targets

-Vocab

-Formulas


Learning Targets

(What you should be able to do by the end of the lesson)

1) I can translate expressions to and from Algebra.

2) I can evaluate algebraic expressions by substituting for variables.


Vocab

Constant: a value that does not change (number)

Variable: a symbol (usually a letter) that represents the value of a variable quantity.

Numerical Expression: a mathematical phrase that has only constants (numbers) and operation symbols.

Algebraic Expression: a mathematical phrase that contains one or more variables.

Toolbox


How do you write an algebraic expression?


1Left Side


How do you write an algebraic expression?

1) 3 more than twice a number x.

2) 7 less than the product of 8 and z.

3) The length of a rectangle is 4 units

greater than its width (w).

1


Practice

Write the algebraic expression that represents the phrase.

1) The quotient of 9 and t.

2) The difference of a number x and 1/2.

3) The sum of m and 7.1.

4) 5 less than x.

Is the expression algebraic or numerical?

5) 2(5 4)

6) 4m + 6

1


Why is "less than" a tricky phrase when writing an algebraic expression?


2 How many words can John type in 3 minutes?

1) John types 62 words per minute. How many words can he type in m minutes?

2) Roberto is 4 years older than Emily, who is y years old. Write an expression for Roberto's age.

3) Isaac earns $5 for every car he washes. How much will he make if he washes c cars?

1


2Evaluate each expression for a=4, b=7, and c=2.

1) b c

2) ac

3) ca + b


HW: Pg. 9 #2131, 34, 36, 3940

1.1 Variables and Expressions.notebook · 2014-09-04 · 1.1 Variables and Expressions.notebook...

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Transcript of 1.1 Variables and Expressions.notebook · 2014-09-04 · 1.1 Variables and Expressions.notebook...