Answer: See below.
Explanation:
In both figures, the lines in the centers of the objects bisect each other at the center. Both section of the line are equal to each other.
7. a. x-3=15; x=5; y+3=12; y=9
8. a. x+6=4x; 3x =6; x=2 5y-8=3y+1: 2y=9; y=(9/2)