# Am I correct? (Direct Proportion)

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#1
I have the question
y is directly proportional to x^2
When x=2, y=10
Which of the following is a formula to show the relationship between x and y?
(a) 10y=2x^2
(b) y=5/2x^2
(c) y=5x^2
(d) y=5/2x
Is it correct to say (b)?
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1 month ago
#2
(Original post by noodlestopshop)
I have the question
y is directly proportional to x^2
When x=2, y=10
Which of the following is a formula to show the relationship between x and y?
(a) 10y=2x^2
(b) y=5/2x^2
(c) y=5x^2
(d) y=5/2x
Is it correct to say (b)?
Yes, as long as what you've written for (b) means (5/2)x^2
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