exam Maths Puzzle Numerical Ability

$.10 per kilowatt-hour. Power consumption of my stereo is .35 kilowatts. I only want to spend $6 for the month on stereo use. How many hours can I play my stereo.

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Can you please help me solve using the substitution method?

x + y = 1
x + y = 2 64-6[15+2(-3+8)] is the question.....ive missed almost 2 weeks of this class and have no idea on how to "show" this in oreder for my instructor. Thank you Tammy Sauve