Evaluating Algebraic Equations

Define; •Variable (p. 71)•Algebraic expression (p. 71)

What is an equation?• In the Language of Algebra, an equation is the

basic number "sentence". • An equation is a mathematical expression that

contains an equals sign.

What is a variable?• Symbol the represents one or more numbers. • Variables are usually letters• Ex: In the algebraic expression, 13 – g, g is the variable

Evaluating Algebraic ExpressionsWhen you evaluate an expression; 1)Replace the variable with the given value2)Solve

Ex: Evaluate each expression. Use p=2, n=3, and s=5.a) 2p + 7 b) p + (n • s)

Writing Algebraic Expressions • Read the expression carefully• One step at a time, replace the key words in the expression with

mathematical operations and keep the numbers & variables.Examples:1) A temperature of t degrees increased by 5 degrees

2) Five cats fewer than c cats

3) The product of 5 and n nickels

4) A dinner bill of d dollars divided among five friends