It is -9. Rise over run. 9 up, 1 to the left, 9/1 = 9. Because the line goes down to the right, it is negative.
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Step-by-step explanation:
A boat with 13 gallons could travel 104 because 240 divided by 30 = 8 and then you do 8 x 13 = 104 miles. Hope this helps