Zvaries jointly with x and y , x=2 and y=2, z=7. find z when x=4 and y=8 using joint variation . (i need the problem worked out step by step)

The value of z = 56

Explanation:

Since we have given that

Z varies jointly with x and y i.e.

z=2 and y=2 then, z=7

So, our required equation becomes

Here, we put our first value of x, y and z ,

We get,

Now,  if we have x=4 and y=8 then z is given by

Hence, the value of z is 56 which varies jointly with x and y.

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