math

posted by johnny

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.

1. Ms. Sue

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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