Using the following graph, how would you determine approximately how fast a galaxy would be moving and if it is moving towards us or away from us in km/s if it were 1,000 Mpc from the Milky Way?
From the graph, I approximate Hubble constant as 31500/500 = 63 km/s/Mpc, nearly.. Answer: 63000 km/s.
I got an approximation to the slope of the line of correlation as (opposite side ) / (base ) = 31500/500 = 63. This is the Hubble rate in km/s/Mpc. So, for distance 1000 Mpc, the velocity is 63000 km/s. nearly.