document.write( "Question 973353: X+Y=10
\n" ); document.write( "X+Z=20
\n" ); document.write( "Y+Z=24
\n" ); document.write( "WHAT IS X+Y+Z \n" ); document.write( "
Algebra.Com's Answer #595560 by macston(5194)\"\" \"About 
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X+Y=10
\n" ); document.write( "Y=10-X Use this to substitute for Y.
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\n" ); document.write( "X+Z=20
\n" ); document.write( "Z=20-X Use this to substitute for Z.
\n" ); document.write( ".
\n" ); document.write( "Y+Z=24 Substitute for Y and Z
\n" ); document.write( "(10-X)+(20-X)=24
\n" ); document.write( "30-2X=24
\n" ); document.write( "-2X=-6
\n" ); document.write( "X=3
\n" ); document.write( ".
\n" ); document.write( "X+Y=10 Put in value for X.
\n" ); document.write( "3+Y=10
\n" ); document.write( "Y=7
\n" ); document.write( ".
\n" ); document.write( "X+Z=20 Plug in value for X.
\n" ); document.write( "3+Z=20
\n" ); document.write( "Z=17
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\n" ); document.write( "CHECK:
\n" ); document.write( "Y+Z=24
\n" ); document.write( "7+17=24
\n" ); document.write( "24=24
\n" ); document.write( ".
\n" ); document.write( "X+Y+Z=?
\n" ); document.write( "3+7+17=?
\n" ); document.write( "27=?
\n" ); document.write( "ANSWER: The sum X+Y+Z=27\r
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