A relationship between two variables in
which the product is a constant.
When one variable increases the other decreases in proportion so
that the product is unchanged.
If b is inversely proportional to a, the equation
is of the form b = k/a (where k is a
Equation: y = 60/x
y is inversely proportional to x.
Doubling x causes y to halve. The product
of x and y is always 60.
Direct variation, joint