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