No, it is not a function, since 6 is repeating itself and the x should never repeat if it’s a function.
Answer:

gallons of paint was used by Lucy.
Step-by-step explanation:

29/12 = 2 5/12
Step 1:Distribute -2 into 5 and 8
Step 2:Subtract 6x from both sides
Step3: Add 16 to both sides
Step 4: Divide -16 into 30