SOLUTION: y varies jointly as a and b, and inversely as the square root of c. If y=135 when a=3, b=9, and c=4; then find y when a=12, b=7, and c=9. thank you!

Question 1113128: y varies jointly as a and b, and inversely as the square root of c. If y=135 when a=3, b=9, and c=4; then find y when a=12, b=7, and c=9.
thank you!
Found 2 solutions by josgarithmetic, josmiceli:
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
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y varies jointly as a and b, and inversely as the square root of c.
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If y=135 when a=3, b=9, and c=4; then fi......
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Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let , , and
= constants of proportionality
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(1)
(2)
(3)
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(1)
(1)
and
(2)
(2)
and
(3)
(3)
(3)
(3)
=======================

(1)
(1)
(1)
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(2)
(2)
(2)
--------------------------

(3)
(3)
(3)
(3)

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