It depends on what you are trying to find if you are trying to find the unit rate for oz/dollar or dollar/oz it differs. But, for the second option it is $0.14 dollars. For the first it is 7.32 oz per dollar. I assume you are trying to find dollar/oz because it makes more sense.
If a line has a slope of 0, the answer would be as x increases, y increases. This is because the slope of a line doesn't change, so to keep it the same, whatever x does, y does too.
Hope that helps u!
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