Question 923601
(x, 7) and 
 (9, 2) m ={{{(y[1] - y[2])/(x[1] - x[2] )}}} = (5)/(x-9) = -9,  {{{x - 9 = -5/9}}} x = 76/9 
m ={{{(y[1] - y[2])/(x[1] - x[2] )}}} ={{{ 5/((-5/9))}}} = -9