# How do you find the midpoint of C (2,9) D (-2,-9)?

Mar 8, 2018

See below

#### Explanation:

The general formula for midpoint M between C and D is

$M \left({m}_{1} , {m}_{2}\right) = \left(\frac{{c}_{1} + {d}_{1}}{2} , \frac{{c}_{2} + {d}_{2}}{2}\right) = \left(\frac{2 + \left(- 2\right)}{2} , \frac{9 + \left(- 9\right)}{2}\right) = \left(0 , 0\right)$

Mar 8, 2018

$\left(0 , 0\right)$

#### Explanation:

$\text{the coordinates of the midpoint (M) are the average of the}$
$\text{coordinates of the endpoints}$

M=[1/2(2+(-2)),1/2(9+(-9)]=(0,0)

Mar 8, 2018

$\left(0 , 0\right)$

#### Explanation:

Just take their averages:

For x value $\frac{2 - 2}{2} = 0$

For y value $\frac{9 - 9}{2} = 0$

$\frac{2 + - 2}{2}$ , $\frac{9 + - 9}{2}$
And your answer is $\left(0 , 0\right)$