document.write( "Question 356620: 3x+y=10
\n" ); document.write( "y=-2x+4\r
\n" ); document.write( "\n" ); document.write( "solve this by using substitution
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Algebra.Com's Answer #254555 by robertb(5830)\"\" \"About 
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Substitute the bottom equation into the top equation:
\n" ); document.write( "3x+(-2x+4)=10.
\n" ); document.write( "3x-2x+4 = 10.
\n" ); document.write( "x = 6. Then
\n" ); document.write( "y = -2(6) + 4 = -12+4 = -8.
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