2, No solution
3, Infinite many solutions 
4, (0,-3)
i hope i was able to help!! so sorry if i made a mistake
        
             
        
        
        
Answer:
B
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer: No
Step-by-step explanation:
Because there is more than one 3 in the following ordered pair. If you make this a table it will be easier.
 
        
                    
             
        
        
        
Answer:
It would take the newer pump 4.5 hours to drain the pool
Step-by-step explanation:
Let's investigate first what is the fraction of the job done in the unit of time (hour in this case) by each pump if the work individually:
older pump: if it takes it 9 hours to complete the job, it does  of the job in one hour.
 of the job in one hour.
newer pump: we don't know how long it takes (this is our unknown) so we call it "x hours". Therefore, in the unit of time (in one hour) it would have completed  of the total job.
 of the total job.
both pumps together: since it takes both 3 hours to complete the job, in one hour they do  of the job.
 of the job.
Now, we can write the following equation about fractions of the job done:
<em>The fraction of the job done by the older pump plus the fraction of the job done by the newer pump in one hour should total the fraction of the job done when they work together.</em> That is in mathematical terms:

and solving for x:
