Question 1099729
NOT direct nor inverse variation.


Look at the slopes between each pair of data point ordered pair.
They must be CONSTANT, if the points all lie on the same line.
Slopes are  {{{system(-1,-1/2,-1/12)}}}.  The data do not represent direct variation.


You expect for inverse variation, {{{y=k/x}}} for some constant k.  In your example, you do not have such a constant.