document.write( "Question 21071: To have a party at the sports club, you must pay $50 plus $5 per guest. Write an equation that relates the number of guest x to the cost of the party y. Use your equation to find the cost of 12 guest. \n" );
document.write( "Solution: \n" );
document.write( " let y denote the cost and x denote the number of guests. \n" );
document.write( " ($50+$5)x=y \n" );
document.write( " The cost of 12 guests, \n" );
document.write( " 12($50+$5)=y \n" );
document.write( " 12*$65 =y \n" );
document.write( " 780$=y \n" );
document.write( " cost of the party for 12 guests is 780$ \n" );
document.write( " \n" );
document.write( "
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