# Precalculus Examples

,

The midpoint formula is .

Set the equal to the coordinate.

Solve for to get .

Substitute the values for and in to get .

Simplify each term.

Multiply by to get .

Multiply by to get .

Add and to get .

Set the equal to the coordinate.

Solve for to get .

Substitute the values for and in to get .

Simplify each term.

Multiply by to get .

Multiply by to get .

Add and to get .

The start point is .