exam Maths Puzzle Numerical Ability

Can you please help me solve using the substitution method?

x + y = 1
x + y = 2

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how do i sove this problem (step by step)
x-y=5 x+2y=7 $.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.