Question

I don't even know where to start on this one.

Eric can spend a maximum of $270 on office supplies. Each ream of paper costs $6. Each ink cartridge costs $18. Which of the following graphs represents the possible combinations of paper and ink cartridges that he may buy

Answer 1

If we say A = ream of paper and B = cost of ink than we can set-up an expression to calculate when A is equal to a number what the number of B will be.

Maximim of 270$ so anything we buy must be equal to this.

Ream of paper cost 6$ each so 6A represents the number of reams bought since we said A is number of reams of paper.

Ink Cartridges are 18$ each so 18B would represent this based on B = to cost of ink.

Now setting up our equation

6A + 18B = 270

When A = 1