Question

what are the 2 main properties of a star graphed on the h - r diagram?
magnitude/luminosity (brightness)
distance a star is from earth
the age of the star
size of the star
color/temperature

Explanation:

The Hertzsprung - Russell (H - R) diagram plots stars based on their luminosity (brightness) and color/temperature which is related to its surface temperature. Luminosity is on the vertical axis and temperature/color on the horizontal axis.

Answer:

Magnitude/Luminosity (brightness), Color/Temperature