,

Use the midpoint formula to find the midpoint of the line segment.

Substitute in the values for and .

Add and .

Divide by .

Factor out of .

Factor out of .

Factor out of .

Cancel the common factors.

Factor out of .

Cancel the common factor.

Rewrite the expression.

Divide by .

Add and .

Find the Midpoint (1,4) , (9,16)