## anonymous one year ago M(4, 2) is the midpoint of RS The coordinates of S are (6, 1). What are the coordinates of R? (5, 1.5) (8, 0) (1.5, 3) (2, 3)

1. anonymous

4 is halfway between 6 and what other number?

2. anonymous

|dw:1439295224539:dw|

3. anonymous

or you can use the midpoint formula $(\frac{ x_1+x_2 }{ 2 },\frac{ y_1+y_2 }{2 })$

4. anonymous

the midpoint of a segment with endpoints (x1 ,y1) and (x2 ,y2) is then (xm ,ym)=(x1+x22,y1+y22) xm and x1 solve for x2 ym and y1 solve for y2. solve: 4=(6+x_(2))/(2) solve: 2=(1+y_(2))/(2)