Question

P varies directly as q and inversely as y. One set of values is P = 0.064, q = 16 and y = 5. Find P when q = 12 and y = 10.
P=
Does anyone know how to do this?

Answer 1

P = kq

q = m/y

Answer 2

Do you know what the number answer would be?

Answer 3

You don't want to solve it?

Answer 4

I don't understand how, or I would.

Answer 5

See,
P = kq

You have P = 0.064, q = 16

Can you find k by plugging in the values?

Answer 6

You would multiply 0.064, and 16?

Answer 7

or divide?

Answer 8

you should divide them.

Answer 9

So it's .004?

Answer 10

Yes you are right..
so .004 is the value of what??

Answer 11

k?

Answer 12

Yes..
Now second equation is:
q = m/y

q = 16 and y = 5 solve for m now..

Answer 13

So you would multiply 16 and 5, to get 80.?

Answer 14

See we have dong wrong..
Let us try once more..

Answer 15

Okay, where did we go wrong?

Answer 16

See, P varies directly with q so,
P = kq

Now you know P = 0.064, q = 16

Now find k..
Till here we were right..

What is the value of k you got?

Answer 17

0.04?

Answer 18

In earlier case you have got different..
check your answer once again..

Answer 19

I'm sorry, I aren't getting this. :/