Last one i need help with

Complete the statements about the system of linear equation respresented by the tables the equation respented the left table is

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.

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b