document.write( "Question 697567: Manny works 40 hours a week. He must work for his parents where he earns $8 per hour. He also works for a computer company where he earns $20 per hour. What is the minimum number of hours Manny can work for the computer company to earn a total of $464 per week from both jobs?\r
\n" ); document.write( "\n" ); document.write( "I have so far figured out this much, but I'm not sure it's correct:\r
\n" ); document.write( "\n" ); document.write( "8x+20y=464
\n" ); document.write( "x+y=40\r
\n" ); document.write( "\n" ); document.write( "Can you help me?\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
Algebra.Com's Answer #430099 by nerdybill(7384)\"\" \"About 
You can put this solution on YOUR website!
Manny works 40 hours a week. He must work for his parents where he earns $8 per hour. He also works for a computer company where he earns $20 per hour. What is the minimum number of hours Manny can work for the computer company to earn a total of $464 per week from both jobs?
\n" ); document.write( "I have so far figured out this much, but I'm not sure it's correct:
\n" ); document.write( "8x+20y=464
\n" ); document.write( "x+y=40
\n" ); document.write( "Can you help me?
\n" ); document.write( ".
\n" ); document.write( "So far, so good.
\n" ); document.write( "Let x = hours working for parents
\n" ); document.write( "and y = hours working for computer company
\n" ); document.write( ".
\n" ); document.write( "solve for x:
\n" ); document.write( "x+y=40
\n" ); document.write( "x=40-y
\n" ); document.write( "substitute above into:
\n" ); document.write( "8x+20y=464
\n" ); document.write( "8(40-y)+20y=464
\n" ); document.write( "320-8y+20y=464
\n" ); document.write( "320+12y=464
\n" ); document.write( "12y = 144
\n" ); document.write( "y = 12 hours
\n" ); document.write( " \n" ); document.write( "
\n" );