Step-by-step explanation:
M is the mid point of AB
here given A ( - 7 , -7) and M ( -6 , -1) Let the coordinates of point B be ( x1, y1)
Now
( - 6 , -1 ) = {( x1 - 7)/ 2 , ( y1 - 7) / 2}
Equating
-6 = x1 -7 -1 = y1 - 7
2. 2
-12 = x1 - 7. -2 = y1 - 7
x1 = -12 +7. y1 = -2 +7
Therefore x1 = - 5. Therefore y1 = 5
Therefore the coordinates of B is ( -5 , 5)
