exam Maths Puzzle Numerical Ability

Determine which two equations represent perpendicular lines.

(a) y=2/9x-3 (b) y=3x-2/9 (c) y=-1/3x+2/9 (d) y=1/3x-2/9

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exam Other Question

A map has a scale of 1 centimeter : 8 Kilometers.Use the given actual distance to find the distance on the map.

30. 4 km

Any help with this equation would be Greatly</b> appreciated.No answers from solver91311 please :) Please help me solve.
Multiply. n^2-n-20/2n^2 x n^2+5n/n^2-25