document.write( "Question 564756: The camera has 10.1 million pixels. The product of the pixels across the screen times the pixels up the screen gives the number of pixels the camera has. The ratio of pixels across the screen to pixels up the screen is 4 : 3. How many pixels does this camera have across the screen? Explain what you are calculating as you solve the problem. \n" ); document.write( "
Algebra.Com's Answer #852272 by Edwin McCravy(20063)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "The camera has 10.1 million pixels. \r\n" );
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document.write( "let x = the number of pixels across the screen.\r\n" );
document.write( "let y = the number of pixels up the screen.\r\n" );
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document.write( "The product of the pixels across the screen times the pixels up the screen \r\n" );
document.write( "gives the number of pixels the camera has.\r\n" );
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document.write( "So \r\n" );
document.write( "\"x%2Ay=matrix%281%2C2%2C10.1%2Cmillion%29\"\r\n" );
document.write( "\"x%2Ay=10100000\"\r\n" );
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document.write( "The ratio of pixels across the screen to pixels up the screen is 4 : 3. \r\n" );
document.write( "\"x%2Fy+=+4%2F3\"\r\n" );
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document.write( "So we have the system of equations:\r\n" );
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document.write( "\"system%28x%2Ay=10100000%2C+x%2Fy=4%2F3%29\"\r\n" );
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document.write( "How many pixels does this camera have across the screen? \r\n" );
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document.write( "Go to https://www.wolframalpha.com/\r\n" );
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document.write( "Type this in: \r\n" );
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document.write( "x*y=10100000, x/y=4/3\r\n" );
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document.write( "Press ENTER\r\n" );
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document.write( "Read\r\n" );
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document.write( "But we know that the answers must be positive, so the answers for x and y are:\r\n" );
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document.write( "\"matrix%281%2C2%2C%0D%0Ax+=+200sqrt%281010%2F3%29%2C+y+=+50sqrt%283030%29%29\"\r\n" );
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document.write( "If you click on \"Approximate forms\" you see:\r\n" );
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document.write( "\"matrix%282%2C2%2Cx+=+-3669.7%2C+y+=+-2752.27%2C%0D%0Ax+=+3669.7%2C+y+=+2752.27%29\"\r\n" );
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document.write( "So the value of x is 3669, since the largest whole number that does not \r\n" );
document.write( "exceed 3669.7 is 3669. Ikleyn rounded up to 3670 but she should have \r\n" );
document.write( "rounded down to 3669.\r\n" );
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document.write( "Answer: 3669 pixels across the screen.\r\n" );
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document.write( "Edwin
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