Question

y varies jointly with p and q. When p = 4 and q = 5, y = 60. Find y when p = 5 and q = 8

Answer 1

There cant be just 1 answer. For exaple, you can say \(y=3pq\) or \(y=60(q-p)\). So the answers will be different.

Answer 2

You have to add an other condition.