Direct Variation:
- Y varies directly with x (e.g. as x increases y increases, or as x decreases y decreases)
- Direct variation will always cause a line to go through the origin
- Represented in the equation y= kx or k = y/x, where k is the constant of variation
Inverse Variation:
- As one variable changes in one way, the other changes in the opposite (e.g. as x increases y then decreases, or if x decreases y then increases)
- Represented by the equation xy = k (k is constant variation)
Alec this is a very nice summary of the verbal definitions, equations, and graphs. It's also well-organized and easy to read.
ReplyDeleteAn example for each would be helpful.