M(7, -4) is the midpoint of RS. if S has coordinates (13,5), what are the coordinates of R?

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Answer 1 · 2015-11-14T16:54:37

#R = (1, -13)#

Notation: #A = (A_x, A_y)#

#M_x = (R_x + S_x)/2#

#M_y = (R_y + S_y)/2#

#7 = (R_x + 13)/2#

#-4 = (R_y + 5)/2#

#14 = R_x + 13#

#-8 = R_y + 5#