exam Maths Puzzle Numerical Ability

x^-1 + y^-1/x^-1

simplify write the answers with all exponents positive

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exam Other Question

Solve and check each of the following equations for x. This is easy and i think I am thinking to hard. Please help.
x/6 - x/8 = 1 Rewrite in standard form:

(0,5),m=-3/5

Give your result in slope intercept form where possible

I do not have a clue as to where to start with this problem, Please help!!