Question 1199694
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Your formula   y = k/x-1   is   AMBIGOUS,   i.e. can be read in two different ways.



One way to read it is   y = (k/x) - 1.


Another way is   y = k/(x-1).



Use parentheses in your formulas when you post to this forum 
to show which part is the numerator and which is the denominator.