document.write( "Question 62881: y=3x
\n" ); document.write( "x+2y=-21 \n" ); document.write( "

Algebra.Com's Answer #43695 by checkley71(8403) $\"\"$ $\"About$

You can put this solution on YOUR website!
Y=3X THEN SUBSTITUTING (3X) FOR Y WE GET
\n" ); document.write( "X+2*3X=-21
\n" ); document.write( "X+6X=-21
\n" ); document.write( "7X=-21
\n" ); document.write( "X=-21/7
\n" ); document.write( "X=-3
\n" ); document.write( "Y=3*-3
\n" ); document.write( "Y=-9
\n" ); document.write( "PROOF
\n" ); document.write( "-3+2Y=-21
\n" ); document.write( "-3+2Y=-21
\n" ); document.write( "2Y=-21+3
\n" ); document.write( "2Y=-18
\n" ); document.write( "Y=-18/2
\n" ); document.write( "Y=-9
\n" ); document.write( "PROOF
\n" ); document.write( "-9=3*-3
\n" ); document.write( "-9=-9 \n" ); document.write( "

\n" );