Posted by **Lily** on Thursday, December 26, 2013 at 4:10pm.

Find the equation of the perpendicular bisector of the line segment joining the points (1, 2) and (-2, 1)

Does it mean I have to find the line. Then find a line that cuts that line in to half because perpendicular bisector

- Math -
**Steve**, Thursday, December 26, 2013 at 4:26pm
just find the slope of the line: 1/3

the perp has slope -3, so now we have a midpoint (-1/2,3/2) and a slope (-3), and our line is

y - 3/2 = -3(x + 1/2)

- Math -
**Lily**, Thursday, December 26, 2013 at 4:44pm
So the equation is -3(x+1/2)?

Like there's no Y= in it?

- Math -
**Steve**, Thursday, December 26, 2013 at 7:30pm
I gave you the equation. There's always a y. If you want it it slope-intercept form, which most people find comforting, that would be

y = -3x

Visit

http://rechneronline.de/function-graphs/

and plot the two functions

(x+5)/3 and -3x

and you will see that the two lines intersect midway between the two given points

## Answer this Question

## Related Questions

- Math -Precal 11 - Show that the point P(7,7) is on the perpendicular bisector of...
- Math - 1. Determine the equation of the right bisector of the line segment E(2, ...
- math plz - hi, is there an equation to finding the perpendicular bisector of a ...
- Math(word problem) - For the line joining points A(-1, 3) and B(5, 7): a.Find ...
- Math 9 - Find an equation for the perpendicular bisector of the line segment ...
- add maths - Find the equation of the perpendicular bisector of the straight line...
- Math - Write a linear equation in slope intercept form for each of the following...
- Algebra 2 - Can someone please check my answers? The question is: Write an ...
- Math - Post a New QuestionCurrent Questions Homework Help: Math Posted by Mikil...
- Please Help! Math - How to find the center and radius of a circle using 3 points...

More Related Questions