book Maths Puzzle Numerical Ability

(x^2=6)2/3=16

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Ok, so I'm given 3 points of a parabola :(9,16) (0,12), and (27,0)..(9,16) is the vertex, (27,0) is an x-intercept, and (0,12) is the y-intercept. It can be inferred that (-9,0) is what is the gradient of a line on a graph that is parallel to y=3x?