PLEASE HELP!:) You bought 4 notebooks for $0.89 each and some reams of paper at a cost of $1.69 each. If you spent a total of $13.70. how many reams of paper did you purchase?

This problem teaches you that:

   (the cost per ream of paper)*(the number of reams of paper) = the cost of all of the paper

                   cost of paper               + cost of printer             = total cost

         ($5 / (ream of paper))  *  x           + $200                      = $450

  Note that we let x=the number of reams of paper

    5x + 200 = 450      (rewrite)

     5x = 250              (subtract 200 from both sides)

     x = 50        (divide both sides by 5)

Checking (very important):

  Is   5(50) + 200 = 450     ?

        250  + 200  = 450     ?

           450 = 450     ? yes

Step-by-step explanation: