exam Maths Puzzle Numerical Ability

Can someone help me out on this problem?

I need to determine which two equations represent perpendicular lines:

(a) y = 5/8 x -3 (b) y = 3x - 5/8 (c) y = -1/3 x + 5/8 (d) y = 1/3 x - 5/8

Thank you, Ashley

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