Indirect Proportions

Question

A rectangular solid with sides a and b, and with a height of 20 cm has a volume of 120 cm³. Find the formula which defines b in terms of a. Why is this formula an indirect proportion? What is the domain of this function?

A rectangular solid with sides a and b, and with a height of 20 cm has a volume of 120 cm³. Find the formula which defines b in terms of a. Why is this formula an indirect proportion? What is the domain of this function?

Answer 1

(a)(b)(20) = 120

(a)(b) = 6

b = 6/b

The variation is inverse since as one values increases the other value decreases.

Or one could say it is inverse since the product of the values is constant.