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Question 49398This question is from textbook Glencoe Geometry
: W,R, and S are points on a number line, and W is the midpoint of line RS. For each pair of coordinates given, find the coordinate of the third point.
I need help on two problems.
Please, show me the step so then I can do the rest of them.
1) R=4, S=-6
2) W= -4, S=2
This question is from textbook Glencoe Geometry
Answer by tiffanyc(9)   (Show Source):
You can put this solution on YOUR website! If W is the midpoint of the line RS, it's basically saying W is exactly halfway between point R and point S. If given R and S we can simply add the R and S points together and divide by 2.
4+ (-6)=-2.......-2/2 =-1 so W=-1
In picture form, one dot will equal 1 number to proove the equation
-6....-1....4, notice there are 4 dots between R and W and 4 dots between S and W.
When either R or S is not given, the same formula can be applied but now algebra is used....or counting, your choice.
(R+S)/2=W
(R+2)/2=-4.....R+2=-8......R=-10, this can also be prooved by the number line
-10.....-4.....2, there are 5 numbers between each R and W and S and W
Hope this helps
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