document.write( "Question 1205685: x=y-5\r
\n" ); document.write( "\n" ); document.write( "3x+y=1
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Algebra.Com's Answer #842675 by greenestamps(13200)\"\" \"About 
You can put this solution on YOUR website!


\n" ); document.write( "One of the two given equations tells you what x is in terms of y. When that is the case, substitution is the obvious logical straightforward approach... although many other methods will get you to the answer.

\n" ); document.write( "\"x=y-5\"

\n" ); document.write( "So...

\n" ); document.write( "\"3x%2By=3%28y-5%29%2By=3y-15=y=4y-15=1\"
\n" ); document.write( "\"4y-15=1\"
\n" ); document.write( "\"4y=16\"
\n" ); document.write( "\"y=4\"

\n" ); document.write( "Then

\n" ); document.write( "\"x=y-5=4-5=-1\"

\n" ); document.write( "ANSWER: (x,y)=(-1,4)

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