M(7, -4) is the midpoint of RS. if S has coordinates (13,5), what are the coordinates of R?
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M(7,-4) is the midpt of RS.
S(13,5),R=?
by midpt formula
x=x1+x2/2
7=x1+13/2
7×2=x1+13
14-13=x1
x1=1
y=y1+y2/2
-4=y1+5/2
-4×2=y1+5
-8-5=y1
y1=-13
therefore R(x1,y1)=(1,-13)
M(7,-4) is the midpt of RS.
S(13,5),R=?
by midpt formula
x=x1+x2/2
7=x1+13/2
7×2=x1+13
14-13=x1
x1=1
y=y1+y2/2
-4=y1+5/2
-4×2=y1+5
-8-5=y1
y1=-13
therefore R(x1,y1)=(1,-13)
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