Question

Determine as coordenadas do ponto B, sabendo que A (-1, 1 ) e M(-1, -1 )

Answer 1

A(-1,1)
B(x,y)
M(-1,-1)

xm = ( xa + xb ) / 2 

-1 = ( -1 + x ) / 2

Sobe o 2 multiplicando o -1

-2 = -1 + x

-2 + 1 = x

x = -1

ym = ( ya + yb ) / 2

-1 = ( 1 + y ) / 2

-2 = 1 + y

-2 - 1 = y

y = -3

B(-1,-3)