document.write( "Question 201617: Solve the system by substitution\r
\n" ); document.write( "\n" ); document.write( "-x-6y=5
\n" ); document.write( "x+6y=7
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Algebra.Com's Answer #151826 by stanbon(75887)\"\" \"About 
You can put this solution on YOUR website!
Solve the system by substitution
\n" ); document.write( "-x-6y=5
\n" ); document.write( "x+6y=7
\n" ); document.write( "----------------
\n" ); document.write( "Solve the 1st equation for \"x\":
\n" ); document.write( "x = -6y-5
\n" ); document.write( "----
\n" ); document.write( "Substitute into the 2nd equation to solve for \"y\":
\n" ); document.write( "-6y-5 + 6y = 7
\n" ); document.write( "-5 = 7
\n" ); document.write( "----
\n" ); document.write( "This is a contradiction.
\n" ); document.write( "It means there is no consistency between the x/y values
\n" ); document.write( "of the two equations.
\n" ); document.write( "It means the graphs of the two equations are parallel.
\n" ); document.write( "The system is said to be inconsistent.
\n" ); document.write( "The system has no solution.
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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