Chapter 8.1, Problem 30E

Brand Z’s annual sale are affected by the sales of related products X and Y a follows: Each $1 million increase in sales of brand X causes a 2.5 million decline in sales of brand Z, whereas each $2 million increase in sales of brand Y results in an increase of 23 million in ate of brand Z. Currently, brands X and Y are each selling $2 million per year, and brand Z is selling $62 million per year. Model the sales of brand Z using a linear function.