Question

If M (3,-5) is the midpoint of A (-3,1) and B(X,Y) find the coordinates of B. Please help me solve this! :)

Answer 1

XM=(XA+XB)/2--->6=-3+x--->xB=9
YM=(YA+YB)/2--->2=1+yA--->yA=1
B(9;1)

Answer 2

Thank you! :)

Answer 3

The midpoint of 2 points is just the average of the coordinates

Answer 4

w8 i've done smth wrong

Answer 5

oh ok

Answer 6

i get
(9,-11)

Answer 7

YM=(YA+YB)/2---> -10=1+yB--->yB=-11

Answer 8

Since M is the midpoint of A, you know that your line should extend in the fourth quadrant. \[\left(\begin{matrix}x2+x1 \\ 2\end{matrix}\right), \left(\begin{matrix}y2+y1 \\ 2\end{matrix}\right)\] is your midpoint formula.

Answer 9

yea the answer is (9;-11)

Answer 10

Thank you all very much for the quick and easy help! :)

Answer 11

your welcome