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I am uncertain of how to calculate luminosity. My biggest problem is determining by how much.

This question that I attached is asking about the luminosities, could you show me how I would work this out. Also, explain how to determine if star A is more luminous how to find out by how much more luminous than star B it would be.

Use the definitions of the magnitude system to answer each of
the following questions.
Which has a greater luminosity, a star with absolute magnitude -1 or a star with absolute magnitude 9 ?
O A star with absolute magnitude -1.
O A star with absolute magnitude 9.

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