Direct
Proportion
Direct Variation
Directly Proportional
A relationship between two variables in which one is a constant multiple of the other. In particular,
when one variable changes the other changes in proportion
to the first.
If b is directly
proportional to a, the equation is of the form b = ka (where k is
a constant).
Equation: y =
4x
Variable y is directly proportional to x.
Doubling x causes y to double. Tripling x causes y to
triple.


See
also
Inverse variation, joint
variation, gravity
