Wikimedia
Wikipedia: Irrational Number
At this site from Wikipedia you can learn the definition of an irrational number, then look at examples and explanations of why some numbers are irrational and others are not.
Other
Math notes.com: Rational Functions
A quick look at graphing rational functions, with investigationa ideas for using a graphing calculator.
Other
Radford University: Rational Functions
This site from the Radford University provides a quick look at graphing rational functions, using a less rigorous approach that is done traditionally.
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Solving Rational Equations
Find a quick, concise explanation of how solve radical equations. Examples are given and clearly explained.
Interactive Mathematics
Interactive Mathematics: Equations Involving Fractions
The method of solving equations with rational expressions is demonstrated through the use of word problem. Exercises are provided for extra practice.
Education Place
Houghton Mifflin: Eduplace: Lesson Plan: What Is It? Rational Numbers
This site is a great place for lesson information on the concept of rational numbers. Three other tabs are available besides the-What Is It? tab. They are Tips and Tricks, When Students Ask, and Lesson Ideas. Each tab has just the right...
Math Medics
S.o.s. Math: Equations Involving Fractions
An explanation on how to solve fractions in rational equations which mentions what to do when extraneous solutions occur when solving.
Curated OER
Lesson Plan: What Is It? Rational Numbers
This site is a great place for lesson information on the concept of rational numbers. Three other tabs are available besides the-What Is It? tab. They are: Tips and Tricks, When Students Ask, and Lesson Ideas. Each tab has just the right...