Question

y=128-8x. how many ounces of juice are in an unopened bottle? y stands for the number of ounces of juice left and x is the number of serving of juice poured from the bottle

Answer 1

Unopened bottle means that it hasn't been used to pour. So that's x=0.

Plug in x=0 and solve for y.

y = 128 - 8(0)
   = 128-0
   = 128

So there are 128 ounces of juice in unopened bottle.