Taylor purchased three types of items (bags of candy, picture frames, and some packs of stickers) from a store. the bags of candy are $1, the picture frames are $2, and the packs of stickers are $3. taylor spent a total of $16 on 9 items, and purchased three times as many bags of candy as she did packs of stickers. how many of each item did she purchase?

if x = the number of bags of candy, y = the number of picture frames, and z = the number of packs of stickers, which equation is not needed to model this situation?
a) x = 3z
b) z = 3x
c) z = x3
d) x + y + z = 9