document.write( "Question 255138: Solve the system of equations using the substitution method\r
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Algebra.Com's Answer #187447 by richwmiller(17219)\"\" \"About 
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substitute 3x for y in x+y=4\r
\n" ); document.write( "\n" ); document.write( "x+3x=4
\n" ); document.write( "combine x and 3x
\n" ); document.write( "divide by 4
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