The Amazon website plans to purchase ads in a local newspaper advertising their site. Their operating budget will allow them to spend at most $2200 on this advertising adventure. They plan to run at most 20 ads. An ad will cost $50 to appear in the weekday paper and $200 to appear in a weekend edition. Prepare a graph that will represent all of the possible combinations of ads under these conditions.
pick a variable for one of the ad types: http://www.purplemath.com/modules/variable.htm
say "d" for week"day"
then do an expression for how much is left for the other type: http://www.purplemath.com/modules/translat2.htm
multiply each type by its cost
add to get the whole cost
set equal to the max they gave you
then back-solve for the other amount
to graph, set the whole-cost expression equal to y (and replace "d" with "x" if that helps you): http://www.purplemath.com/modules/graphlin.htm
if you get stuck please write back showing your work