Posted by **kate** on Friday, August 29, 2014 at 11:07am.

11. The midpoint of is E(–1, 0). One endpoint is C(5, 2). What are the coordinates of the other endpoint?

can someone please explain how to do this problem

- math -
**Steve**, Friday, August 29, 2014 at 11:13am
For the x-coordinate,

C is 6 units to the right of E

For the y-coordinate,

C is 2 units above E

So, since E is the midpoint, the other endpoint is

6 to the left and 2 below E, or (-7,-2)

Algebraically, you know that if the ends are C and D,

(Cx+Dx)/2 = Ex

(Cy+Dy)/2 = Ey, so

(5+Dx)/2 = -1

(2+Dy)/2 = 0

5+Dx = -2

Dx = -7

2+Dy = 0

Dy = -2

as shown above

- math -
**kate**, Friday, August 29, 2014 at 11:38am
thank you

- math -
**mia**, Friday, August 29, 2014 at 12:15pm
did you use the midpoint formula

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