Post on 05-Jan-2016
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