book Maths Puzzle Numerical Ability

Now this is a challenge for me. the question reads, write an equation in slope-intercept form of the line that passes through a given point and is perpendicular to the graph of each equation. problem #33 is (6, -13), 2x - 9y = 5

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book Other Question

Solve: 3^x * 9^-x =27^x Subtract 2x-3x^2+5x^3 from 5x^3+4x-x^2

Thank you.