document.write( "Question 392080: Sheridan's monthly phone bill includes a fixed charge, which is the same each month, and an additional charge for toll calls. One month the bill was $22, which included charges for 5 toll calls. The following month the bill was $26, which included charges for 7 toll calls. Find the fixed charge and the average charge per toll call.
\n" ); document.write( " \n" ); document.write( "
Algebra.Com's Answer #278248 by stanbon(75887)\"\" \"About 
You can put this solution on YOUR website!
Sheridan's monthly phone bill includes a fixed charge, which is the same each month, and an additional charge for toll calls.
\n" ); document.write( "-------------------------
\n" ); document.write( "One month the bill was $22, which included charges for 5 toll calls.
\n" ); document.write( "f + 5t = 22
\n" ); document.write( "-------------
\n" ); document.write( "The following month the bill was $26, which included charges for 7 toll calls.
\n" ); document.write( "f + 7t = 26
\n" ); document.write( "-------------
\n" ); document.write( "Find the fixed charge and the average charge per toll call.
\n" ); document.write( "===============
\n" ); document.write( "Subtract 1st from 2nd equation and solve for \"t\":
\n" ); document.write( "2t = 4
\n" ); document.write( "t = $2 (cost of a toll call)
\n" ); document.write( "------------
\n" ); document.write( "Since f + 5t = 22
\n" ); document.write( "f + 5*2 = 22
\n" ); document.write( "f = $12 (fixed charge)
\n" ); document.write( "===========================
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );