Please help! & please explain each step The midpoint of ab is m(4 2). If the coordinates of a are (6 -4) what are the coordinates of b? I always have problems with this .

Question

Please help! & please explain each step 
The midpoint of ab is m(4 2). If the coordinates of a are (6 -4) what are the coordinates of b?
I always have problems with this >.< Please help! thank you!! C:

nikato · Answer

|dw:1402626685835:dw|

and do you know the midpoint formula?

anonymous · Answer

yes (Xm,Ym)= (x+x/2), (y+y/2)

nikato · Answer

yes. so let's find the x-coordinate of point a first.
got any ideas how to do it?

anonymous · Answer

plug in what they give

nikato · Answer

yes
do you want to show me how you would set up the equation?

anonymous · Answer

yes, that's what I always forgot. the way to set it, I know what to do, but I forget

nikato · Answer

|dw:1402627414450:dw|
this is to find the x-coordiate of point a.
does it make sense?