Perform the operation: 3 gal, 1 qt. -1 gal, 3 qt. 5 gal 4 gal,4 qt. 1 gal. 2 qt. 1 gal

Ah, college mathematics.

We must remember there are four quarts per gallon.  Let's convert everything to gallons:

3 \frac 1 4 - 1 \frac 3 4 = \frac{13}{4} - \frac{7}{4} = \frac{6}{4} = 1 \frac 2 4

We don't reduce because it's easy to see that's 1 gallon, 2 quarts, third choice.

A.

Step-by-step explanation:

To find the y-intercept, we need to remember that a y-intercept literally means that that's where the graph crosses the y-axis, aka the x value is 0.

So our y intercept is (0, -6)

To graph slope, we can use rise/run ("rise over run") to help us remember which direction we need to go.

If the slope is positive, we rise and the run to the right. If it is negative, we fall and run to the left.

Our slope is 2, which is also written as 2/1, so we rise two units, and move right one unit.