document.write( "Question 274010: Rate Increase. Patricia knows that at some point during the calendar year her basic monthly telephone rate increased from $17.10 to $18.40. If she paid a total of $207.80 for basic telephone service for the calendar year, in what month did the rate increase take effect? \n" ); document.write( "
Algebra.Com's Answer #200045 by richwmiller(17219)\"\" \"About 
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1710x+1840y=20780
\n" ); document.write( "x+y=12
\n" ); document.write( "x=10 and y=2
\n" ); document.write( "Rate increase took effect in November
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