At 4: 00 am, there were 800,000 gallons of water remaining at a reservoir. after 4 hours of irrigation, there were 100,000 gallons of water remaining. write an equation that describes the number of gallons of water as a function of the time the field has been irrigated

The linear equation could be: r = 800,000 - 175,000h, where r represents the amount of water in the reservoir and h represents the number of hours since 4:00 am.

To find this equation, you must first find the slope. Divide the total change in water by the total number hours of the change.

We have:  800000/4 = 175,000  This means that the water is going down by 175,000 gallons per hour.

Now, just add in the starting amount of 800,000 gallons and you have your equation.