Example: Express as a formula and find : kyvaries directly as the square root of . If x4,then 32xy==. Example: qis directly proportional to the product of and and inversely proportional to the square of t. xs(a) Express in terms of q,,, and x s tk. (b) If , then 2,3,and 10xst== −=6q= −. Find qwhen 1,4,and 3xst===.