math problem-sales? I will love you forever if you can help me?!?!?

Catface

New member
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 $2.6 million decline in sales of brand Z, whereas each $1 million increase in sales of brand Y results in an increase of $0.6 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).)

I swear I thought it was

z=-2.6x+0.6y

but thats wrong apparently, so what do you think?!?
i love youuuuu thank you!
althoughhhh it still says its wrong :(
 
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