System of Equations: determining the values of two or more variables.
Here’s a link to webbased software that will calculate a system of equations:
http://www.1728.com/unknwn2.htm
However, I would recommend using a TI graphing calculator’s capabilities for this. Not only is the calculator very capable, many students should have access to one (hopefully through school).
Exercise
Solve y=3x+1 and y=x+5 by graphing the equations and finding out where they intersect.
Problem
The Smith family is trying to decide between installing cable or satellite. Cable has a onetime installation charge of $45 and then $34 charge per month. Satellite has a $185 charge for installation and then ongoing costs of $20 per month. What would you advise they do?

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