Directly proportional
A mathematical relationship between two things that can be given by the equation y = kx, where k is a constant value.
In other words, when one object increases, another increases by the same amount.
In other words, when one object increases, another increases by the same amount.
Example:
The chance of toast hitting the buttered side-up is directly proportional to the cost of the carpet.
The chance of toast hitting the buttered side-up is directly proportional to the cost of the carpet.