Question 155337
Sure. let's say your class is heading to a museum. There is a $10 admission charge and the bus to take your there costs $4round trip. It's an all day affair, so each student must bring $6 for lunch.

For you to go, you will need to pay {{{admission + BusFare + Food}}} 
{{{10 + 4 + 6 = 20}}} 

It costs you $20.

It will also cost every other student who goes $20 too.

So the {{{TotalCost = CostPerStudent * NumberOfStudent}}}
{{{c = 20 * n}}}

{{{graph(400,400, -10, 20, -10, 200, 20x)}}}