The graph of the amount of water drained versus time is a linear graph.
We can determine the equation to be:
[tex]Amount\text{ of water drained = 75 - 5 }\times\text{ time}[/tex]
The domain and range of the function are :
Domain: Represents the set of allowable time(x values) that satisfies the equation:
[tex]\begin{gathered} 0\text{ }\leq\text{ time }\leq\text{ 15} \\ or \\ 0\text{ }\leq\text{ x }\leq\text{ 15} \end{gathered}[/tex]
Time cannot be negative.
Range : Represents the set of allowable Amount of water drained(y values):
[tex]\begin{gathered} 0\text{ }\leq\text{ Amount }\leq\text{ 75} \\ 0\text{ }\leq\text{ y }\leq\text{ 75} \\ \end{gathered}[/tex]
The amount of water drained starts at 75 litres and stops at zero