document.write( "Question 562141: how do i do this problem? y=2x, x+y=12 \n" ); document.write( "
Algebra.Com's Answer #364456 by TutorDelphia(193)\"\" \"About 
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since we know y=2x I can plug in 2x anywhere I see a y\r
\n" ); document.write( "\n" ); document.write( "x+2x=12
\n" ); document.write( "combine like terms
\n" ); document.write( "3x=12
\n" ); document.write( "divide both sides by 3
\n" ); document.write( "x=4\r
\n" ); document.write( "\n" ); document.write( "plug 4 in for x
\n" ); document.write( "y=2*4
\n" ); document.write( "y=8
\n" ); document.write( "
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