exam Maths Puzzle Numerical Ability

Can you please help me solve this problem...instructions...determine which two equations represent perpendicular lines.
(a)y=4/9x-3
(b)y=3x-4/9
(c)y=-1/3x+4/9
(d)y=1/3x-4/9

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exam Other Question

3x^3-24

Since 24 is not a perfect cube I think I factor out the 3 as follows:
3(x^3-8)
Am I on the right track? Translate the following statement into an algebraic equation. Let x represent the number. 7 less than 10 times a number is 9 times that same number.