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A point on the parabola y^2=18x at which...

A point on the parabola `y^2=18x` at which the ordinate increases at twice the rate of the abscessa is (1) `(2,4)` (2) `(2,-4)` (3) `(-9/8,9/2)` (4) `(9/8,9/2)`

A

(2,4)

B

(2,-4)

C

`((9)/(8), (9)/(2))`

D

`((-9)/(8),(9)/(2))`

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The correct Answer is:
C
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