exam Maths Puzzle Numerical Ability

Hi Can I have some help with the following problem?

The resistance R of a wire varies directly as its length L and inversely as the square of its diameter d.
(a) Write an equat

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exam Other Question
enumerate the ratio of performing the operations on series of number. Solve each of the system by using either addition or substitution. If a unique solution does not exist, state whether the system is dependent or inconsistent.
10x + 2y = 7
y = -5x + 3

Any help is appreciated. Thanks