Check my answer in bold.
which statement corrects the flaw in gina's proof?
select one:
a. the slope of segments de and ac is not 0.
b. segments de and ac are parallel by construction.
c. the coordinates of d and e were found using the midpoint formula.
d. the coordinates of d and e were found using the slope formula.

Solution:

Option (C) is true , which corrects the flaw in Gina's proof.

Which is The coordinates of D and E were found using the Midpoint Formula.

As we have to prove line segment joining the mid point of two sides of triangle is parallel to third side.

Gina has proved this by considering a triangle ABC having coordinates A(0,0),.

We got the mid point of Segment AB which is D by using Mid point formula and mid point of segment  BC which is E using Mid point formula.

Mid point formula for line joining two points  

Rest part is correctly done by Gina.

moderators are

where does the z at is it on the x axes or on the y axes any way if it is on the y axes put it horizontally and if it is on the x axes put it vertically