exam Maths Puzzle Numerical Ability

Write an equation for the line that is perpendicular to the given line and that passes through the given point.

(6,4) y = 3x-2

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This is a question from question paper given in MCA exam of paper Descrete Mathematics.Hence there is no ISBN NO.
I have no idea of algebra polynomials.Hence Iam just guessing it. How do you solve x to the second power-5x-6=0?