A=115+1/2(p+s) solve for s

How do you solving the solution of each system using elimination?

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.

Do you mind if you guys me with this question i’m on number 8