Dave did 3 more dives than he did laps and Crystal did 4 more laps than she did dives
ANSWER
x=12, y=10
EXPLANATION
The diagonals of a parallelogram bisect each other.
This implies that;
AE=EC


Also, DE=EB;


Put equation (2) in (1).

Expand;



Put x=2, into equation (2).


2 x2-1,. 2x2=1 or all in the photo any problem in question then ask me