Might as well make a fool of myself trying the answers to these.
You know AE is ½AC and AC = x so
AE = ½x
To get from B to C you could go BA + AC, you know AB is y so BA = -y
so BC is -y + x or x-y
Lastly it tells you DE and BC are parallel and we know E is halfway between A and C (AE = ½AC) so D is half way between A and B
so AD = ½AB which is ½y
I hope I've remembered this right, let the flaming begin![]()