The cost of 3 pounds of grapes is $6.57 whats the constant proportionality that relates to the cost in dollars ,y, to the number of pounds of grapes ,x?

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.