This is a bit trickier to set up as we are given two different units to work with from the outset, time and distance. Well we know that distance (d) is a function of time (t) and rate (r) so we can set up this equation right away:
d = rt
or in terms of time as is suggested by the needs of the problem: t = d/r
We do not know the rate at which he will be walking so we could set that to x, and we do know that distance is restricted by the following inequality: 9 <= d <= 12. You will need to graph two different lines here, one representing when d = 9 and the second when d = 12 and lightly shading the area in between the curves using the following statements: y = 9 / x and y = 12 / x. The other graph is much easier, you'll only need to lines: y = 4.5 and y = 6 and shade the area in between those.
To be honest, I'm not entirely sure number 1 is worded correctly as the graphs will be tough to construct, especially compared to the relative ease of number 2. You may want to ask your teacher on that one.
