SOLUTION: a.)Suppose z varies jointly as y and x. If z =105 when x=5 and y=7, what is z when x=12 and y=1? b.)Suppose y varies inversely with x and that y=15 when x=12. What is the value

Algebra ->  Rational-functions -> SOLUTION: a.)Suppose z varies jointly as y and x. If z =105 when x=5 and y=7, what is z when x=12 and y=1? b.)Suppose y varies inversely with x and that y=15 when x=12. What is the value      Log On


   

Question 1076393: a.)Suppose z varies jointly as y and x. If z =105 when x=5 and y=7, what is z when x=12 and y=1?
b.)Suppose y varies inversely with x and that y=15 when x=12. What is the value of y when x=3?
Answer by josgarithmetic(39618) About Me  (Show Source):
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a.)Suppose z varies jointly as y and x. If z =105 when x=5 and y=7, what is z when x=12 and y=1?
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z=k%2Axy

k=z%2F%28xy%29
k=105%2F%285%2A7%29
k=3
MODEL: highlight_green%28z=3xy%29

Substitute the next given values to answer the question.