Question

No Links Please!

In the xy-plane, the midpoint M of segment AB has coordinates (-1, 3).
And point A has coordinates (-3,0). What is the x-coordinate of point B?


O -1

O 1

O 2

O 3

Answer 1

So the midpoint coordinates=((xA+xB/2),(yA+yB/2))
so (xA+xB)/2=xM
Sub in (-3+xB)/2=-1
Rearrange xB=(-1x2)+3
And solve xB=1 so the answer is one :)