The answer to your question would be 7y - 12.If you need more information on the steps needed to simplify the expression go to the link provided in the comments.
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First day, we break up the gallon into 4 quarts. So now we have 2 quarts 3 pints 1 cup.
After the second day, we end with 2 quarts 1 cup!
D because there are 10 gallons of gas remaining as you can see on the y axis and 10 gallons is being used for each 10 miles because 10 x 10 is 100 and the graph is counting up by 10
M has to equal 2. 11-5 equals 6. 6-4 is 2. 2 is the missing value.