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Posted by **tyler** on Tuesday, June 21, 2011 at 9:21am.

x varies directly with y and z.

x = 400 when y = 8 and z = 10.

Find x when y = 10 and z = 12.

- math -
**MathMate**, Tuesday, June 21, 2011 at 9:47amIf

"x varies directly with y and z",

that means

x=kyz, where k is a constant.

Since

x = 400 when y = 8 and z = 10

or

400=k(8)(10),

we can readily solve for k=5.

Hence solve for x when

when y = 10 and z = 12

(hint: k=5)

- math -
**Anonymous**, Tuesday, January 10, 2012 at 9:45amDetermine the equation of combined variation. Then solve for the missing value.

x varies directly with y and inversely with z.

x = 5 when y = 10 and z = 5.

Find x when y = 20 and z = 10.

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