Question

The point on the parabola $y^2=18x$, for which the ordinate is three times the abscissa, is

• A. (6, 2)
• B. (-2, -6)
• C. (3, 18)
• D. (2, 6)

Answer 1

The correct option is D (2, 6)

Let y = 3x, then $(3x{)}^2=18x$
$\Rightarrow 9x^2=18x\Rightarrow x=2andy=6$

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