document.write( "Question 773363: solve 2x+y=-1
\n" ); document.write( " y=x+8
\n" ); document.write( "using the substitution method \n" ); document.write( "

Algebra.Com's Answer #471495 by Tatiana_Stebko(1539) $\"\"$ $\"About$

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$\"system%282x%2By=-1%2C+y=x%2B8%29\"$
\n" ); document.write( "Substitute $\"y=x%2B8\"$ into the first equation of the system
\n" ); document.write( " $\"2x%2B%28x%2B8%29=-1\"$
\n" ); document.write( " $\"2x%2Bx%2B8=-1\"$
\n" ); document.write( " $\"3x=-9\"$
\n" ); document.write( " $\"x=-3\"$
\n" ); document.write( "Substitute $\"x=-3\"$ into $\"+y=x%2B8\"$
\n" ); document.write( " $\"y=-3%2B8\"$
\n" ); document.write( " $\"y=5\"$
\n" ); document.write( " $\"system%28x=-3%2C+y=5%29\"$ - the solution of the system
\n" ); document.write( "Check the answer
\n" ); document.write( " $\"system%282%2A%28-3%29%2B5=-1%2C+5=-3%2B8%29\"$
\n" ); document.write( " $\"system%28-1=-1%2C+5=5%29\"$ - correct
\n" ); document.write( "Answer: (-3, 5) \n" ); document.write( "

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