SOLUTION: Suppose that y varies directly with x and inversely with z, and y = 25 when x = 35 and z = 7. Write the equation that models the relationship. Then find y when x = 12 and z = 4.

Question 1112997: Suppose that y varies directly with x and inversely with z, and y = 25 when x = 35 and z = 7. Write the equation that models the relationship. Then find y when x = 12 and z = 4.

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Suppose that y varies directly with x and inversely with z, and y = 25 when x = 35 and z = 7. Write the equation that models the relationship. Then find y when x = 12 and z = 4.
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y = k*x/z
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Solve for "k"::
25 = k*35/7
25 = k*5
k = 5
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Equation:
y = 5*x/z
Find y when x = 12 and z = 4
y = 5*12/4
y = 15
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Cheers,
Stan H.
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