SOLUTION: what is the endpoint B(x,y)of segment AB if A is(0,-4) and the midpoint is (0,-2)? I don't really know how to do it I only know the midpoint formula. Thanks!!

Algebra ->  Length-and-distance -> SOLUTION: what is the endpoint B(x,y)of segment AB if A is(0,-4) and the midpoint is (0,-2)? I don't really know how to do it I only know the midpoint formula. Thanks!!      Log On


   

Question 400179: what is the endpoint B(x,y)of segment AB if A is(0,-4) and the midpoint is (0,-2)? I don't really know how to do it I only know the midpoint formula. Thanks!!
Answer by Tatiana_Stebko(1539) About Me  (Show Source):
You can put this solution on YOUR website!
if A(x1,y1) B(x2,y2)then midpoint M(x,y)formula
x=%28x1%2Bx2%29%2F2 y=%28y1%2By2%29%2F2
In text A(0,-4) midpoint is (0,-2), put in formula
for x ...x=%28x1%2Bx2%29%2F2
0=%280%2Bx2%29%2F2
%280%2Bx2%29=0
x2=0
for y ...y=%28y1%2By2%29%2F2
-2=%28-4%2By2%29%2F2
-4%2By2=-2%2A2
y2=-4%2B4
y2=0
B(0,0)