Question 610028
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Hi, 
Find the value of x so that the line joining the points(x,3)and (2,1)is parallel to the line joining (x,5)and (-1,2)
Note:  slopes Equal  {{{m =(y[2] - y[1])/(x[2] - x[1])}}}
(x,3)and 
(2,1) {{{m = 2/(x-2)}}}

(x,5)and 
(-1,2) {{{m = 3/(x+1)}}}
 {{{2/(x-2)= 3/(x+1)}}}   ||Cross Multiplying to solve
    3(x-2) = 2(x+1)
       x = 8