Answer:
AB = 4
Step-by-step explanation:
Since point P bisects AB, we have ...
AP = PB
y/2 = y - 2
0 = y/2 - 2 . . . . subtract y/2
0 = y - 4 . . . . . . multiply by 2
4 = y . . . . . . . . . add 4
Now, we can find AB:
AB = 2(AP) = 2(1/2y) = y
AB = 4
