exam Maths Puzzle Numerical Ability

Determine which two equations represent perpendicular lines.

A) y = 8x-1
B) y = 1/8x+1
C) y = -1/8x+1
D) y = 1/8x-1

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exam Other Question

I want to know the next four letters of this pattern: T,F,S,N,E,T Separate 150 into two parts such that 4 times the larger exceeds 5 times the smaller by 60.