SOLUTION: In the standard (x,y) coordinate plane, point M with coordinates (5,4) is the midpoint of AB and B has coordinates (7,30. What are the coordinates of A?

Algebra ->  Coordinate-system -> SOLUTION: In the standard (x,y) coordinate plane, point M with coordinates (5,4) is the midpoint of AB and B has coordinates (7,30. What are the coordinates of A?      Log On


   

Question 367906: In the standard (x,y) coordinate plane, point M with coordinates (5,4) is the midpoint of AB and B has coordinates (7,30. What are the coordinates of A?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Use the midpont formula,
x%5Bm%5D=%28x%5BA%5D%2Bx%5BB%5D%29%2F2
5=%287%2Bx%5BB%5D%29%2F2
x%5BB%5D%2B7=10
.
.
.
y%5Bm%5D=%28y%5BA%5D%2By%5BB%5D%29%2F2
4=%283%2By%5BB%5D%29%2F2
y%5BB%5D%2B3=8