1. L1-6 Notes: Algebra: Variables and Expressions
Chapter 1
L1-6 Notes:
Algebra: Variables and Expressions

2. Vocabulary ALGEBRA - a language of symbols.
VARIABLE - a symbol, usually a letter, used to represent a number.
ALGEBRAIC EXPRESSIONS - are combinations of variables, numbers, and at least one operation.
EVALUATE – to find the value of the algebraic expression.

3. Other ways to express multiplication
2 ∙ 3 = 2 × 3
4(5) = 4 × 5
5t = 5 × t
st = s × t

4. Examples Evaluate each expression if m = 4 and z = 9. 3 + m z – m

5. Examples
Evaluate each expression if a = 2, b = 5, and c = 7
4c – 5 + 3
6a ÷ 3 + 4
10 + 6b × 3