document.write( "Question 945147: Solve the system using substitution.
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\n" ); document.write( "y = x + 4
\n" ); document.write( "y = 3x \n" ); document.write( "
Algebra.Com's Answer #576313 by MathLover1(20849)\"\" \"About 
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\n" ); document.write( "\"y+=+x+%2B+4\"......eq.1
\n" ); document.write( "\"y+=+3x\"......eq.2
\n" ); document.write( "------------------------substitute \"3x\" for \"y\" in eq.1\r
\n" ); document.write( "\n" ); document.write( "\"3x+=+x+%2B+4\"......eq.1...solve for \"x\"\r
\n" ); document.write( "\n" ); document.write( "\"3x+-x+=+4\"\r
\n" ); document.write( "\n" ); document.write( "\"2x+=+4\"\r
\n" ); document.write( "\n" ); document.write( "\"x+=+4%2F2\"\r
\n" ); document.write( "\n" ); document.write( "\"highlight%28x+=2%29\"\r
\n" ); document.write( "\n" ); document.write( "go to \"y+=+3x\"......eq.2 substitute \"2\" for \"x\" and solve for \"y\"\r
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\n" ); document.write( "\n" ); document.write( "\"y+=+3%2A2\"\r
\n" ); document.write( "\n" ); document.write( "\"highlight%28y+=+6%29\"\r
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