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Find the slope of a line joining the given points.
 
S. No Points Slope
(i) (-6,1) and (-3,2) ii
(ii) \left(\frac{-1}{3}, \frac{1}{2} \right) and \left(\frac{2}{7}, \frac{3}{7} \right) ii
(iii) (14,10) and (14,-6)