An empty 6-gal water jug weighs 0.5 lb. With 3 c of water inside, the jug weighs 2 lb. Which equation models the jug’s weight y when it contains x cups of water?
a. y= 0.5x + 0.5
b. y= 0.5x - 0.5
c. y= -0.5x - 0.5
d. y= -0.5x + 0.5
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