Question

Help! The midpoint of CD is E(–1, 0). One endpoint is C(5, 2). What are the coordinates of the other endpoint? Explain the process...

Answer 1

I use midpoint formula

x=1/2 (x1 + x2)

Assuming x1=5
And x=-1 (midpoint)
-1=1/2 (5+ x2)
-2=5+x2
x2= -7

y=0
Y1=2

Y=1/2 (y1+y2)
0=1/2(2+y2)
0=2+y2
y2=-2
hence, coordinates are (-7,-2)