# Precalculus Examples

,

The midpoint formula is .

Set the equal to the coordinate.

Solve for to get .

Substitute the values for and in .

Simplify each term.

Multiply by .

Multiply by .

Subtract from .

Set the equal to the coordinate.

Solve for .

Substitute the values for and in .

Simplify each term.

Multiply by .

Multiply by .

Subtract from .

The start point is .