Answer: see the graph attached.
Explanation:
The equation has the form of the equation of the line:

Where m is the slope and b is the y-intercept (the axis called "w" in this case)
Then b=600.
Find the intersection with the x-axis (the axis called "t" for in this case) by susbtituting w=0 into the equation and solve for t:

THen you must draw a line that passes through the points (0,600) and (-24,0) as you can see in the graph attached.