document.write( "Question 145090: The Wilson's pay their babysitter $5 per hour before 11 pm and $7.50 per hour after 11 pm. one evening they went out for 5 hours and paid the sitter $30.00. what time did they come home? \n" ); document.write( "
Algebra.Com's Answer #105775 by stanbon(75887)\"\" \"About 
You can put this solution on YOUR website!
The Wilson's pay their babysitter $5 per hour before 11 pm and $7.50 per hour after 11 pm. one evening they went out for 5 hours and paid the sitter $30.00. what time did they come home?
\n" ); document.write( "------------------------------------
\n" ); document.write( "Let number of hrs. before 11 pm be \"x\".
\n" ); document.write( "Let number of hrs. after 11 pm be \"y\".\r
\n" ); document.write( "\n" ); document.write( "--------------------------
\n" ); document.write( "Hours equation: x + y = 5
\n" ); document.write( "Value equation: 5x + 7.5y = 30
\n" ); document.write( "-------------------------------
\n" ); document.write( "x = 5-y
\n" ); document.write( "Substitute to get:
\n" ); document.write( "5(5-y) + 7.5y = 30
\n" ); document.write( "25 -5y +7.5y = 30
\n" ); document.write( "2.5y = 5
\n" ); document.write( " y = 2 hrs (# of hours after 11:00)
\n" ); document.write( "---------------
\n" ); document.write( "They arrived home at 1:00 am
\n" ); document.write( "=================================
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
\n" ); document.write( " \n" ); document.write( "
\n" );