Question

If y varies jointly with x and z, what is the constant of proportionality when y = 30, x = 4, and z = 5?

Answer 1

It is `k=3/2`

Explanation:

If y varies with x and z then

`y=kxz=>30=k*4*5=>k=30/20=3/2`

where `k` is the constant of proportionality.