exam Maths Puzzle Numerical Ability

(a) Complete the table, which gives the details about two investments made by a retired couple.
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exam Other Question
determine which two equation 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 I would like to know how to solve this inequality of X+1/X-3>=1