Respostas

  • Usuário do Brainly
2014-03-04T20:15:32-03:00
Pmx =  \frac{x1+x2}{2}  \\  \\ Pmy =  \frac{y1+y2}{2}

-1/2 = (7 + Xb)/2
2(-1/2) = 7 + Xb
-1 = 7 + Xb
Xb = -8

-3/2 = (4 + Yb)/2
2(-3/2) = 4 +Yb
-6/2 - 4 = Yb
-3 -4 = Yb
Yb = -7

B(-8, -7)


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