Complete the steps for solving the system of linear equations in Exercise 1. Substitute 2y + 5 for x in the first equation. 4( ) + 3y = 9 8y+ + =9 y= y= Then, x = 2( ) + 5 = + 5 = . The solution 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.