Hi,

Im trying to do this question

is directly proportional to and when . Find the value of when

Now put 147 into the formulae with

Answer book says 39, how?

Thanks

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- Nov 1st 2008, 01:34 PMTheHourDirect and Proportion
Hi,

Im trying to do this question

is directly proportional to and when . Find the value of when

Now put 147 into the formulae with

Answer book says 39, how?

Thanks - Nov 1st 2008, 03:29 PMmosqueteroanswr
Hi!

The problem says it is directly proportional so:

y=kx

if it were inversely proportional it would be y=k/x as you wrote.

Now if you calculate as you were doing but with the above correction you will arrive to k=3 and eventually you will obtain y=39 for x=13 - Nov 1st 2008, 03:50 PMTheHour
Thanks. I should read the question in future (Giggle)