SOLUTION: I am lost can you help me with this problem? Z varies directly as x and inversely as y. If z=123 when x=6 and y=6, find z if x=7 and y=8.

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Question 1059054: I am lost can you help me with this problem?
Z varies directly as x and inversely as y. If z=123 when x=6 and y=6, find z if x=7 and y=8.

Found 3 solutions by stanbon, josmiceli, MathTherapy:
Answer by stanbon(75887)   (Show Source): You can put this solution on YOUR website!
Z varies directly as x and inversely as y.
Z = k*x/y
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Solve for "k" using "If z=123 when x=6 and y=6"
123 = k*6/6
k = 123
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Equation::
Z = 123*x/y
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Find z if x=7 and y=8.
Ans: Z = 123*7/8 = 138.375
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Cheers,
Stan H.
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Answer by josmiceli(19441)   (Show Source): You can put this solution on YOUR website!


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and are constants
of proportionality
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given:


and


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Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!
I am lost can you help me with this problem?
Z varies directly as x and inversely as y. If z=123 when x=6 and y=6, find z if x=7 and y=8.

------- Substituting 123 for Z (not z), 6 for x, and 6 for y
123 = k

------- Substituting 123 for k, 7 for x, and 8 for y

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