Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Inverse Variation
Find a quick, concise explanation of inverse variation. An example is given and clearly explained.
University of Illinois
University of Illinois: Quadratic Formula
This site from the University of Illinois offers an excellent simulation of the quadratic formula, where you can type in different values for a, b, and c, and then view the change in the answer for x.
Purple Math
Purplemath: Variation Equations
Purplemath offers an extensive explanation of direct and inverse variation, containing several examples and real-world applications.
