exam Maths Puzzle Numerical Ability

find the constant variation of 7y=2x

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exam Other Question

Determine which two equations represent perpendicular lines.

A) (b) and (c) B) (c) and (d) C) (a) and (b) D) (a) and (d)

Thanks Again Simplify
n^-2/n^3
I got n^5
Please help, Thank you=)