document.write( "Question 360583: Solve the system of equations. How do I solve one of the equations for one variable then substitute the solution back into the other 2 equations. \n" ); document.write( "
Algebra.Com's Answer #257365 by Alan3354(69443)\"\" \"About 
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Do it like this:
\n" ); document.write( "Show how you would solve the following systems of equations:
\n" ); document.write( "x + Y + Z = 6
\n" ); document.write( "2X – Y + 3Z = 8
\n" ); document.write( "3X – 2Y – Z = -17
\n" ); document.write( "Eliminate y:
\n" ); document.write( "Add eqns 1 & 2
\n" ); document.write( "x + Y + Z = 6
\n" ); document.write( "2X – Y + 3Z = 8
\n" ); document.write( "---------------- Add
\n" ); document.write( "3x + 4z = 14
\n" ); document.write( "--------
\n" ); document.write( "Multiply eqn 1 by 2, and add to eqn 3
\n" ); document.write( "2x + 2y + 2z = 12
\n" ); document.write( "3X – 2Y – Z = -17
\n" ); document.write( "------------------ Add
\n" ); document.write( "5x + z = 5
\n" ); document.write( "3x +4z = 14
\n" ); document.write( "----------- Now it's 2 eqns in x & z. Can you finish it?
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