document.write( "Question 440021: What is the value of x in the solution to the system if equations. \r
\n" ); document.write( "\n" ); document.write( "x + 2y + 4z = 12
\n" ); document.write( "y + 2z = 8
\n" ); document.write( "5y = 10 \n" ); document.write( "

Algebra.Com's Answer #304050 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
(1) $\"+x+%2B+2y+%2B+4z+=+12+\"$
\n" ); document.write( "(2) $\"+y+%2B+2z+=+8+\"$
\n" ); document.write( "(3) $\"+5y+=+10+\"$
\n" ); document.write( "There are 3 equations and 3 unknowns, so it's solvable
\n" ); document.write( "(2) $\"+y+%2B+2z+=+8+\"$
\n" ); document.write( "(2) $\"+2z+=+-y+%2B+8+\"$
\n" ); document.write( "(2) $\"+z+=+%28-1%2F2%29%2Ay+%2B+4+\"$
\n" ); document.write( "Substitute this into (1)
\n" ); document.write( "(1) $\"+x+%2B+2y+%2B+4%2A%28%28-1%2F2%29%2Ay+%2B+4%29+=+12+\"$
\n" ); document.write( "(1) $\"+x+%2B+2y+-+2y+%2B+16+=+12+\"$
\n" ); document.write( "(1) $\"+x+=+-4+\"$
\n" ); document.write( "and
\n" ); document.write( "(3) $\"+5y+=+10+\"$
\n" ); document.write( "(3) $\"+y+=+2+\"$
\n" ); document.write( "and
\n" ); document.write( "(2) $\"+z+=+%28-1%2F2%29%2Ay+%2B+4+\"$
\n" ); document.write( "(2) $\"+z+=+%28-1%2F2%29%2A2+%2B+4+\"$
\n" ); document.write( "(2) $\"+z+=+-1+%2B+4+\"$
\n" ); document.write( "(2) $\"+z+=+3+\"$ \n" ); document.write( "

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