Question 818155
slope =y2-y1/x2-x1
slope (m)= 5-1/3-2
          =4/1=4
equation of line passing through points (3,5)(2,1)
Y-y1=m(X-x1)
Y-1=4(X-2)                    
y-1=4x-8                          
y=4x-7                         
   or                               
   y-5=4(x-3)
y-5=4x-12
y=4x-12+5
  y=4x-7
by both process we will get 
Answer y=4x-7