If y is directly proportional to x^2 and y=1/8 when x=1/2, what is the positive value of x when y=9/2?

a) 3/4

b) 3/2

c) 9/4

d) 3

e) 9

what i did:

y: 1/8

x^2: 1/4

1/8 * 36 = 9/2

therefore

1/4 * 36 = 9

but the answer is 3, not 9...

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- Jan 1st 2010, 11:55 PMjuliakRegarding direct proportions
If y is directly proportional to x^2 and y=1/8 when x=1/2, what is the positive value of x when y=9/2?

a) 3/4

b) 3/2

c) 9/4

d) 3

e) 9

what i did:

y: 1/8

x^2: 1/4

1/8 * 36 = 9/2

therefore

1/4 * 36 = 9

but the answer is 3, not 9... - Jan 2nd 2010, 12:23 AMGrandad
- Jan 2nd 2010, 12:25 AMearboth
- Jan 2nd 2010, 03:10 AMHallsofIvy