Y= -2(x)+7 I'm pretty sure....
        
             
        
        
        
I'm guessing you're saying that the sprinkler is shooting out 23 ft of water.
This would be the same as the radius of a circle, and we're trying to find the area. Use the formula.

Plug in what we know:


This is what they could be looking for, an exact value. If they want an approximation, we can input 3.14 for Pi:

 
 
        
        
        
Y=5 it's a horizontal lines so b in y=mx+b would have to be 5 and since it's horizonal, it doesn't have a slope so it's just y=5