We are having a discussion about direct variation and direct proportion.
Math teachers frequently refer to a variable being directly proportional to a function if y = k g(x). For example, the volume of a cylinder with a fixed height is directly proportional to the square of its radius.
The question is: Are direct proportion and direct variation the same thing or is direct variation restricted to items of the form: y = kx?
Ron Vavrinek Illinois Mathematics and Science Academy Math Team Leader 1500 W. Sullivan Road firstname.lastname@example.org Aurora, IL 60506 (708) 907-5964
Remember: "Even if you are on the right track, you'll still get run over if you just sit there." Will Rogers