exam Maths Puzzle Numerical Ability

Determine which two equations represent perpendicular lines.

(a)y=4/7x-3 (b) y=3x-4/7

(c) y=1/3x+4/7 (d) y=1/3x-4/7

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exam Other Question

(4x-3)^3/2=8 Can someone help me solve this quadtratic problem:

2x2+7x+5

4+7x+5
9+7x