Which of the following matrices could be used to solve the system of equations? 2x + y - z = -8

2y + 3z = -6

-x + y + z = -4

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.