If y varies directly as the square root of x

[Gus]

If y varies directly as the square root of x and inversely as the square of z and y=5.754 when x=1.12 and z=7.95, then find y when x=4.18 and z =4.88.
y=?

I don't understand these?

 

[stapel]

I don't understand these?

The short explanation: Variation equations translate as follows:

. . . . ."y varies directly as x": y = kx
. . . . ."y varies inversely as x": y = k/x
. . . . ."y varies with x and z": y = kxz

But if you missed the classes on variation equations, and the book and the class-notes you got from a friend aren't working, then a quickie explanation or one more worked example probably isn't going to help, either. :shock:

Instead, please try studying some of the many lessons available online:

. . . . .Google results for "variation equation inverse direct"

Once you have studied some lessons (at least two!) and have learned the basic terms and techniques, please attempt the exercise. If you get stuck, please reply showing all of your work and reasoning, starting with the basic form of the inverse-variation equation that you used. :idea:

Please be complete. Thank you!

Eliz.