## Variables, Expressions, and Equations

Variables, Expressions, and Equations
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Taught by muchomath

### Meets NCTM Standards:

Created by and copyright of Larry Perez. Funded by the state of California through Saddleback College. More information on videos, resources, and lessons at Algebra2Go.
Learn to evaluate expressions given values of a variable. Also, learn to determine whether a value is a solution to an equation.

• What is a variable?
• How do you work with variables in expressions and equations?
• What is an expression and how do you evaluate an expression?
• How do you evaluate the expression x + 5 if x = 4?
• How do you evaluate the expression 2x - 9 if x = 4?
• How do you evaluate the expression 3x^2 - 17 if x = 4?
• What is x + y if x = 3 and y = -1?
• How do you evaluate 2x - y if x = 3 and y = -1?
• What does (3x - y^2)/(2xy) equal if x = 3 and y = -1?
• Is x = 5 a solution to x + 2 = 6?
• Is x = 5 a solution to 2x + 2 = x^2 - 13?
This lesson will walk you though the idea of replacing a variable with a value in an expression and then evaluating the value of the expression. All terminology is defined and all steps are explained as you go through some example problems. Determining if values of a variable are solutions to equations or not.
• Currently 4.0/5 Stars.
Reviewed by MathVids Staff on June 13, 2010.  