Original post by Peanut247
How do you do this type of question?
Do you know how to rewrite a statement like "x is directly proportional to the square of z" in terms of indices and some unknown constant(s)?
Original post by davros
Do you know how to rewrite a statement like "x is directly proportional to the square of z" in terms of indices and some unknown constant(s)?
x [directly proportional to] k(z^2)
Original post by Peanut247
x [directly proportional to] k(z^2)
Original post by Peanut247
x [directly proportional to] k(z^2)
Not quite - see TenOfThem's correction!
Now you should be able to write something similar for the case of inverse proportion
Original post by davros
Not quite - see TenOfThem's correction!
Now you should be able to write something similar for the case of inverse proportion
Now you should be able to write something similar for the case of inverse proportion
y=1/(z^3)
Original post by Peanut247
y=1/(z^3)
Original post by Peanut247
y=1/(z^3)
Again, see TenOfThem's correction - you missed out the constant!!
Now you just need to combine these things in various ways
Original post by davros
Again, see TenOfThem's correction - you missed out the constant!!
Now you just need to combine these things in various ways
Now you just need to combine these things in various ways
This was the bit I got stuck on.. I tried making them both equal z but just flopped!
Original post by TenOfThem
Thank you :P
Original post by Peanut247
This was the bit I got stuck on.. I tried making them both equal z but just flopped!
Try making them both
Original post by TenOfThem
Try making them both
y=k/z^3 becomes 1/y^2 = kz^6
x=kz^2 becomes x^3 = kz^6
So x^3 = 1/y^2 making the answer D?
Original post by Peanut247
y=k/z^3 becomes 1/y^2 = k^2z^6
x=kz^2 becomes x^3 = k^3z^6
So x^3 = k/y^2 making the answer D?
x=kz^2 becomes x^3 = k^3z^6
So x^3 = k/y^2 making the answer D?
But, yes, D
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