Brand Z's annual sales are affected by the sales of related
products X and Y as follows: Each $1 million increase in
sales of Brand X causes
a $2.1 million decline in sales of Brand
Z, whereas each $1 million increase in sales
of Brand Y results in an increase
of $0.1 million in sales of Brand
Z. Currently, Brands X, Y, and Z are each
selling $6 million per year. Model the sales
of Brand Z using a linear function.
(Let *z* = annual sales
of *Z* (in millions of
dollars), *x* = annual sales
of *X* (in millions of dollars),
and *y* = annual sales
of *Y* (in millions of dollars).)

* z* =

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Given that sales of Brand Z is a linear function of X and Y, So  z = Ax + By + C Given that, $1 million increase in sales of Brand X causes a $2.1 million decline in sales of Brand Z, So A = -2.1 $1 million increase in sales of Brand Y results in an increase of $0. ... See the full answer