document.write( "Question 509600: Lana ordered concert tickets that cost $7.50 for children and $12.00 for adults. She ordered 8 more children's tickets than adults' tickets. Her total bill was $138. How many of each type of ticket did she order? \n" ); document.write( "
Algebra.Com's Answer #341524 by mananth(16946)\"\" \"About 
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Adult tickets x numbers
\n" ); document.write( "Child tickets y numbers
\n" ); document.write( "y-x=8
\n" ); document.write( "-1 x + 1 y = 8 .............1
\n" ); document.write( "12 x + 7.5 y = 138 .............2
\n" ); document.write( "Eliminate y
\n" ); document.write( "multiply (1)by -7.5
\n" ); document.write( "Multiply (2) by 1
\n" ); document.write( "7.5 x -7.5 y = -60
\n" ); document.write( "12 x 7.5 y = 138
\n" ); document.write( "Add the two equations
\n" ); document.write( "19.5 x = 78
\n" ); document.write( "/ 19.5
\n" ); document.write( "x = 4
\n" ); document.write( "plug value of x in (1)
\n" ); document.write( "-1 x + 1 y = 8
\n" ); document.write( "-4 + 1 y = 8
\n" ); document.write( " 1 y = 8 + 4
\n" ); document.write( " 1 y = 12
\n" ); document.write( " y = 12
\n" ); document.write( "Adult tickets 4 numbers
\n" ); document.write( "Child tickets 12 numbers
\n" ); document.write( "m.ananth@hotmail.ca \r
\n" ); document.write( "\n" ); document.write( "If you want to solve with one variable
\n" ); document.write( "let adults tickets be x numbers
\n" ); document.write( "children 's tickets = x+8\r
\n" ); document.write( "\n" ); document.write( "12*x+7.5(x+8) = 138\r
\n" ); document.write( "\n" ); document.write( "solve for x
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