posted by kennedy .
write an equation in general form...
the perpendicular bisector of the segment with endpoints at (2,-1) and (4,-5). I found the slope and then found the mid point and wrote to the equation and got X-2Y=3. But the answer is X-2Y=9...any help???
slope is of the segment is -2, you got that correct, and slope of bisector is 1/2, right. The midpoint is at 3,-3
-3=3/2 + b
y=1/2 x -4.5
The mid point of the segment is
You have correctly calculated the slope m as 1/2.
Using the equation
You have probably mis-calculated the mid-point as (-3,-3)