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1

Step-by-step explanation:

To find slope, find 2 good points, I'll use (1,3) and (2,4).

Start with the point highest on the line and subtract the y values, in this case 4-3. Now, your y value is 1.

Then do the same with the x values, in this case 2-1. Now, your x value is 1.

The equation for slope is y/x, so all you have left is to substitute your new values in and simplify (if you can).

He multiplied 3/4 by 1/5 instead of dividing 3/4 by 1/5.

Step-by-step explanation:

Correct is 3/4 / 1/5

= 3/4 * 5

= 15/4 gallons per minute.