SOLUTION: Suppose you are starting an office cleaning service. You spent $315 on equipment. To clean an office you use $4 worth of supplies. You charge $25 per office. How many offices must

Question 125156: Suppose you are starting an office cleaning service. You spent $315 on equipment. To clean an office you use $4 worth of supplies. You charge $25 per office. How many offices must you clean to break even?
My Work
x = supplies
y = charge per office
x + y = 315
4x + 25y = 315
-4(x + y = 315)
-4x - 4y = -1260
4x + 25y = 315
21y = -4

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Suppose you are starting an office cleaning service. You spent $315 on equipment. To clean an office you use $4 worth of supplies. You charge $25 per office. How many offices must you clean to break even?
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Let "x" be the number of offices you clean.
Expenses: 315+4x dollars
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Income: 25x dollars
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EQUATION:
Break even means expenses = income
315+4x = 25x
21x = 315
x = 15 (# of offices you need to clean)
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Cheers,
Stan H.
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