noodlestopshop
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I have the question
a is directly proportional to the cube of b
When a=20, b=2
Find a when b=4
For my answer I got 160, is that correct?
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GabiAbi84
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Yes
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noodlestopshop
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(Original post by GabiAbi84)
Yes
Thankyou!
By any chance do you know if the questions in the image linked are correct? (these ones are inverse)Name:  questions.PNG
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GabiAbi84
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Question 2 is correct,
Question 3 is wrong.
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noodlestopshop
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(Original post by GabiAbi84)
Question 2 is correct,
Question 3 is wrong.
would question 3 be (D)?
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GabiAbi84
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(Original post by noodlestopshop)
would question 3 be (D)?
Are you guessing or have you calculated it?
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noodlestopshop
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(Original post by GabiAbi84)
Are you guessing or have you calculated it?
I didn't guess, I was substituting numbers in. I thought it would be (D) because 18/3 = 6 and y=6. But I just realised that (A) also equals 6 however (D) is in the equation form for inverse, so I'm not sure if it's correct I just assumed it's my only other option.
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GabiAbi84
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(Original post by noodlestopshop)
I didn't guess, I was substituting numbers in. I thought it would be (D) because 18/3 = 6 and y=6. But I just realised that (A) also equals 6 however (D) is in the equation form for inverse, so I'm not sure if it's correct I just assumed it's my only other option.
Yes, so since the question states that they are inversely proportional you need to start with the equation y=k/x

Then substitute the numbers into That to get the value for k instead of working backwards from the multiple choice answers.
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