SOLUTION: Given A =(3,1) & B =(0,y-1). Find y if AB = 5.

Algebra ->  Geometry-proofs -> SOLUTION: Given A =(3,1) & B =(0,y-1). Find y if AB = 5.       Log On


   

Question 894618: Given A =(3,1) & B =(0,y-1). Find y if AB = 5.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Use the distance formula,
AB%5E2=%283-0%29%5E2%2B%281-%28y-1%29%29%5E2
25=3%5E2%2B%282-y%29%5E2
%282-y%29%5E2=16
2-y=4
y=-2