exam Maths Puzzle Numerical Ability

can you please explain this to me

Find the equation, in standard form, with all interger coefficients, of the line perpendicular to 3x - 6y = 9

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exam Other Question

You have some money on deposit in a bank account which pays a nominal (or quoted) rate of 8.0944 percent, but with interest compounded daily (assuming a 365 day year). Your friend find the coordinates of the midpoint of a segment with the given endpoints:
A (0,0), B (-8,6)