Relax

Respuesta :

x_1=x-coordinate of first coordinate pair

Midpoint formula: M=((x_1+x_2)/2, ((y_1+y_2)/2)

the origin is (0,0) and you are given (-5, -9)
M=((0-5)/2, (0-9)/2)
M=(-5/2, -9/2)
M=(-2.5, -4.5)