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What can you determine about the solutions of this system

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.

The holiday party will cost $160 if 8 people attend. if there are 40 people who attend the party, how much will the holiday party cost