Question 858632
let x = number of hours
let y = number of kilometers
for the bus, y = 60x
for the car, y = 80(x-1)
what happens is:
when x = 0, the bus is at 0 miles traveled.
when x = 1, the car is at 0 miles traveled.
disregard any negative values below x-axis or to the left of the y-axis as those are invalid values because the number of hours can't be less than 0 and the number of miles can't be less than 0.
the only reason they are shown is to show the x-axis values and the y-axis values.
if the graph is shown starting at 0, you wont' be able to see them.
the graph below the first graph shows you what i mean.
it's the same graph but the x-axis starts at 0 and the y-axis starts at 0.
you can see that, while the second graph is technically more correct since negative values are not allowed, the values on the y-axis and the x-axis don't show up which is why the first graph shows some negative values as well even though they are not valid.
first graph is shown below:
{{{graph(600,600,-1,5,-100,400,60x,80(x-1))}}}
second graph is shown below:
{{{graph(600,600,0,5,0,400,60x,80(x-1))}}}