Point Q(-1,b) is the midpoint of segment EF. Co-ordinates of point E are (-4,a) and point F are (2,0). What is the value of a and b?

Point Q(-1,b) is the midpoint of segment EF. Co-ordinates of point E a

1.	Point Q(-1,b) is the midpoint of segment EF. Co-ordinates of point E are (-4,a) and point F are (2,0). What is the value of a and b?
A.	a = 2; b = 1
B.	a = -2; b = -1
C.	a = -4; b = -8
D.	a = 4; b = 8
Answer» C. a = -4; b = -8