### Home > GC > Chapter 7 > Lesson 7.3.3 > Problem 7-123

7-123.

On graph paper, graph lines

and if can be represented by and can be represented by *y*= − 1. Label their intersection*E*. Homework Help ✎What is the relationship between the lines? How do you know?

If

*E*is a midpoint of , what type of quadrilateral could*ABCD*be? Is there more than one possible type? Explain how you know.

Examine each line's slope to determine the relationship between the two lines.

If *E* is a midpoint of *CD*, their diagonals would be perpendicular bisectors.