document.write( "Question 1018567: 3u+z=15
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Algebra.Com's Answer #634645 by ikleyn(52786) $\"\"$ $\"About$

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document.write( "3u +  z = 15,    (1)\r\n" );
document.write( " u + 2z = 10.    (2)\r\n" );
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document.write( "Substitute u = 10 - 2z from (2) into (1). You will get a single equation for u:\r\n" );
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document.write( "3*(10-2z) + 2z = 10.\r\n" );
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document.write( "Simplify and solve it:\r\n" );
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document.write( "30 - 6z + 2z = 10,\r\n" );
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document.write( "30 - 10 = 4z, \r\n" );
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document.write( "4z = 20, \r\n" );
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document.write( "z =  = 5.\r\n" );
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document.write( "Now find u from (2).\r\n" );
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