Answer:
The solution is given in the picture attached below
Explanation:
The galaxies aren't distributed randomly throughout the universe but they are grouped in gravitationally bound clusters.
The slope of the line is
(change in ' y ' between the ends) / (change in ' x ' between the ends)
Slope = (630g - 0) / (70 cm^3 - 0)
Slope = (630 / 70) g/cm^3
<em>Slope = 9.0 g/cm^3</em>