The table shows the number of gallons of sasoline in a cars gas tank after the car has been driven $ \times $ miles.
Gasoline Usage
\begin{tabular}{|c|c|}
\hline Miles Driven, & Gallons of Gasoline in Tank, y \
\hline 0 & 15 \
\hline 10 & $ 14.6 $ \
\hline 20 & $ 14.2 $ \
\hline 35 & $ 13.6 $ \
\hline 60 & $ 12.6 $ \
\hline 75 & 12 \
\hline
\end{tabular}
When these data are graphed on a coordinate grid, the polnts all lie on the same line. What are the slope and $ y $-intercept of this line?
Slope $ =1 / 25, y $-intercept $ =375 $
Slope $ =-1 / 25, y $-intercept $ =15 $
Slope $ =25, y $-intercept $ =375 $
Slope $ =-25, y $-intercep $ =15 $

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