Will mark brainliest and you will get 30 points

step-by-step explanation:

graph using a few selected

x         y

-1       15

0         6

1         2.4

2       0.96

twenty-six miles over two gallons because the proportion for the original 13 miles to one gallon would be written 13/1 and, doing the same thing to the top and bottom, i multiplied by 2 and got 26/2