,

The midpoint formula is .

Set the equal to the coordinate.

Solve for .

Substitute the values for and in .

Simplify each term.

Multiply by .

Multiply by .

Add and .

Set the equal to the coordinate.

Solve for .

Substitute the values for and in .

Simplify each term.

Multiply by .

Multiply by .

Add and .

The end point is .

Find the End Point Given Start (-3,-4) and Mid (-2,-9) (-3,-4) , (-2,-9)