What is the reason for statement 3 in this proof?
a) using point-slope formula
b) definition of parallel lines
c) transitive property of equality
d) reflexive property of equality
e) definition of midpoint

- E) definition of midpoint

Explanation :-

We can look at the second step in the statement which says that" point D is the mid point of AB and E the point of BC " .

And we know that definition of midpoint says that "If a point is a mid point of line segment with end points

Then the coordinates of the mid point must be

."

And statement 3 say

and  , where D and E are mid points .

Thus the reason for statement 3 must be the definition of mid point.

the answer to this question is in the pic