Homework Help: math

Posted by johnny on Monday, March 17, 2008 at 4:42pm.

Suppose you are starting an office-cleaning service. You have spent $315. To clean an office, you use $4 worth of supplies. You charge $25 per office. How many offices must you clean to break even?

I don't understand this. I just made an equation, 4x + 25y = 315.

math - Ms. Sue, Monday, March 17, 2008 at 4:47pm
Let's do it this way.

$25 - 4 = $21. This is your profit for one office.

$315 / $21 = 15

You'd have to clean 15 offices to break even.

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