Question 31162
1. the line formular is y=mx+b
   in d, m is -1/2, y=(-1/2)x+b
         passing the point (5,2), 2=(-1/2)5+b
                                   =(-5/2)+b then b=9/2
   answer) y-(-1/2)x+(9/2)

2. the formular for the slope is (change of y)/(change of x)
   (u got the wrong formular).
   so, m is 4/(-3), then y=(-4/3)x+b
   to find value of "b", substitude any point value.
                         3=(-4/3)(-1)+b
                          =(4/3)+b, then, b is 5/3
   answer) y=(-4/3)x+(5/3)