Question

Find the equation of variation in which y varies jointly as x and z and y=8, x=4 and z=2

Answer 1

if a varies directly with b, then it means

a = k*b

If y varies jointly as x & z, then it means y = k * x * z

So, if 8 = k * 4 * 2

Then k = 1, and y = x*z