Answer:
the galaxy is moving away from us and the magnitude of the displacement gives the value of the relative velocity
Step-by-step explanation:
The wavelength and frequency of light is affected by the relative motion of the Source (galaxy) and the observer (us on Earth); when the shift is towards the red it indicates that the bodies are moving away from each other.
Consequently the galaxy is moving away from us and the magnitude of the displacement gives the value of the relative velocity