Question 5441
the distance is the same on either side of the centre. 


From the centre to (2,-1) we have moved 6 units in the x-direction and -8 units in the y-direction.


So, in the other direction, we need to go -6 units in the x-direction and 8 units in the y-direction... Hence 


x: -4-6 --> -10
y: 7+8 --> 15


so point is (-10,15)


jon.