SOLUTION: Write a formula that expresses the relationship described below. P varies jointly as x and y and P = 7 when x = –1 and y = –6. I'm not sure, but I think it would be P = 6/

Algebra ->  Expressions -> SOLUTION: Write a formula that expresses the relationship described below. P varies jointly as x and y and P = 7 when x = –1 and y = –6. I'm not sure, but I think it would be P = 6/      Log On


   

Question 150792: Write a formula that expresses the relationship described below.
P varies jointly as x and y and P = 7 when x = –1 and y = –6.


I'm not sure, but I think it would be P = 6/7xy

Answer by mangopeeler07(462) About Me  (Show Source):
You can put this solution on YOUR website!
P+=+6%2F7xy
plug in P, x and y

7=6/7(-1)(-6)

7=6/42
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Try one of these:

P=+-%28x%2By%29

P = 7 when x = –1 and y = –6.

7=-(-1+-6)
7=-(-7)
7=7

or the latter:

P=%287%2F6%29%28xy%2F1%29 (which perhaps is what you meant from the start)

7=7/6 times 6
7=7