# How do you find the missing coordinate given one point A(2,8) and the midpoint M(5,4)?

##### 2 Answers

B(8,0)

#### Explanation:

Subtract the point A x-coordinate from the midpoint x-coordinate (final-initial) to find the distance between them. This will give you 3. Multiply the by 2 because the midpoint is halfway between point A and B. This will give you 6. Add six to point A's x-coordinate and this will give you 8. Do the same process with the y-coordinates to get 0, but be careful of the negative.

The other point is at

#### Explanation:

You can substitute the values you have into the midpoint formula:

The midpoint is

"the average of the x-values and the average of the y-values"

The other point is at