Question 23732
Let "c" be the number of cars.
Let "v" be the number of vans.
Then 5c is the number of students in the cars.
And 8v is the number of students in the vans.
INEQUALITY:
5c + 8v <= 40
Solve for c as follows:
c <= (40-8v)/5
Graph it on a vc coordinate system. Let the
independent variable be v and the dependent be c. 

Cheeers,
Stan H.