Answer:
The coordinates of B are ( 6,-3)
Explanation:
A ( 8,3) B( x,y) M = (7,0)
To find the x coordinate of the midpoint add the two x coordinates of the endpoint and divide by 2
(8+x)/2 = 7
Multiply each side by 2
(8+x) = 14
Subtract 8 from each side
8+x-8 = 14-8
x = 6
To find the y coordinate of the midpoint add the two y coordinates of the endpoint and divide by 2
(3+y)/2 = 0
Multiply each side by 2
(3+y) = 0
Subtract 3 from each side
3+y-3=0-3
y = -3
The coordinates of B are ( 6,-3)