exam Maths Puzzle Numerical Ability

on a quiz, jane answers 6 is an element of the set of integers while john answers {6} is an element of the set if integers. john does not receive full credit while jane does. why

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exam Other Question
n-5 1 n-3
---- = --- - ----
6n-6 9 4n-4

I tried to my best to type the fractions so I hope this makes sense. Can you help me solve this? Write an equation for the line containing the indicated points.

(-9,1) and (-1/2,1)