SOLUTION: Violet knows that her subscription rate for the basic tier of cable television increased from $18.20 to $19.50 at some point during the calendar year. She paid a total of $230.10 f

Question 368759: Violet knows that her subscription rate for the basic tier of cable television increased from $18.20 to $19.50 at some point during the calendar year. She paid a total of $230.10 for the year to the cable company. Determine the month of the rate increase.
Answer by rfer(16322) (Show Source): You can put this solution on YOUR website!
x+y=12 x=-y+12
18.20x+19.50y=230.10
18.20(-y+12)+19.50y=230.10
-18.20y+218.40+19.50y=230.10
1.30y=11.7
y=9 mo at $19.50
x=12-y=3 mo at $18.20

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