The following amounts of water have not been listed.
However, to find m all you need to do it;
the amount of water which is in the tank - 124 = x
x ÷ 9 = m
8-4/0-2 =4/-2= -2
So it has a negative slope
Set the two equal to each other and solve for x
-2x+1 = -2x²+1
-2x= -2x²
x=x²
x²-x=0
x(x-1) =0, so x is either 0 or 1
two solutions, namely (0,1) and (1,1)
