An online music club sells compact discs for $9 each plus $1.50 shipping and handling per order. Maria’s total bill was $82.50. Using the following equation, how many compact discs did Maria purchase

9

Step-by-step explanation:

The equation is

9x + 1.50 = 82.50

You must isolate the 9x , to do so you have to subtract 1.50 from both sides.

9x + 1.50 = 82.50

      -1.50    -1.50

9x = 81

isolate the variable (x), to do so you have to divide both sides by 9

9x = 81

/9     /9

=

x = 9