Question

y varies directly as the square of x. When x = 1, y = 3. What is the value of y when x = 3?

Answer 1

Y=X^2, now just substitute X=3 you'll get Y

Answer 2

We need the equation y = kx in the general form.

but we have y = kx^2 and substituting in the x = 4 and y = 32 value we get

32 = k((4)^2

32 = 16k

2 = k

so the equation becomes y = 2x^2

if we want to find x when y = 18 we get

18 = 2x^2

9 = x^2

x = 3 or x = -3

Answer 3

my options are:
1
9
27
81

Answer 4

9

Answer 5

could you explain why please?

Answer 6

u can see in my ans

Answer 7

just put X=3 and then take square of it...since Y=X^2 therefore it is just square of three

Answer 8

taken from
http://answers.yahoo.com/question/index?qid=20100924160042AAdzBNT

Answer 9

ohh thanksss everyone!

Answer 10

welcom