What is step 10 in this proof? A.

Statement: Two of the three medians share point P.

Reason: Using point-slope formula

Statement: Point P lies on line A'E' and line A'E'.

Reason: Algebra

c.

Statement: Point P lies on line C'D'.

Reason: The coordinates of P satisfy the equation of line C'D'.

Statement: line A'E' and line A'E' are concurrent.

Reason: Definition of concurrence

D.

O

E.

Statement: All three lines share point P.

Reason: Definition of midpoint