Divide total cost by number of donuts bought:
9.96 / 12 = 0.83
Each donut cost $0.83

If 
Then:

Sub in the coordinates given to you:

Now:

Move 1.5 to the other side of the equation and flip the sign.

Therefore,
.
Replace in the formula (y=mx+c):

There is your answer.
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Step-by-step explanation: Theirs your help!
Answer:
19 cents or 0.199
Step-by-step explanation:
Hope it helped!
What are we multiplying exactly?