Which of the following choices is equivalent when solving the system by the elimination method? x + 2y = 1
2x + y = 12

a)x + 2y = 1
-4x − 2y = -24

b)x + 2y = 1
-2x − 2y = -1

c)x + 2y = 1
4x − 2y = 24

d)None of these choices are correct.

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.