document.write( "Question 1037468: x+2y=4, x=y-5\r
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Algebra.Com's Answer #652113 by ikleyn(52794) $\"\"$ $\"About$

You can put this solution on YOUR website!
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document.write( "1. \r\n" );
document.write( "x + 2y = 4,    (1)\r\n" );
document.write( "x = y - 5.     (2)\r\n" );
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document.write( "Hey, you are lucky! They just did almost everything for you.\r\n" );
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document.write( "They just expressed x via y in the equation(2), and all you need to do is to substitute it instead of x into equation (1).\r\n" );
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document.write( "In this way you will get a single equation for \"y\" with the only unknown \"y\":\r\n" );
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document.write( "(y-5) + 2y = 4.    (3)\r\n" );
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document.write( "You can easily solve it for y. \r\n" );
document.write( "When you complete it for \"y\", calculate \"x\" via (2).\r\n" );
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document.write( "2.\r\n" );
document.write( "y = x-1,             (1)   \r\n" );
document.write( "y = .    (2)\r\n" );
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document.write( "Take the expression (1) for \"y\" and substitute it into (2). You will get\r\n" );
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document.write( "x-1 = ,\r\n" );
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document.write( "which is a single equation on \"x\".\r\n" );
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document.write( "You are lucky for the second time!\r\n" );
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