Warm Up Simplify.  3  1 2. 87  15  5 3. 6(9 + 2) + 7 4. 35  7  5

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Warm Up Simplify. 1. 4 + 7  3  1 2. 87  15  5 3. 6(9 + 2) + 7 4. 35  7  5 24 84 73 25

Vocabulary variable constant algebraic expression evaluate

A variable is a letter or symbol that represents a quantity that can change. A constant is a quantity that does not change.

Algebraic Expressions NOT Algebraic Expressions An algebraic expression contains one or more variables and may contain operation symbols. So p  7 is an algebraic expression. Algebraic Expressions NOT Algebraic Expressions 150 + y 85 ÷ 5 35  w + z 10 + 3  5 To evaluate an algebraic expression, substitute a number for the variable and then find the value.

You can write multiplication and division expressions without using the symbols  and . Instead of . . . You can write . . . x  3 x  3 x(3) 3x 35 y 35 ÷ y When you are multiplying a number times a variable, the number is written first. Write “3x” not “x3.” Read 3x as “three x.” Writing Math

Examples Evaluate 16 + b if b = 25

Examples Evaluate x – y if x = 64 and y = 27

Example Evaluate 5t + 4 if t = 3