document.write( "Question 843162: Solve by the substitution method. I need to see it worked out. I keep getting the wrong answer. Answer I'm supposed to get is {(-1,9)}\r
\n" ); document.write( "\n" ); document.write( "x - 5y = -5
\n" ); document.write( "-2x - 4y = -4
\n" ); document.write( " \n" ); document.write( "

Algebra.Com's Answer #507981 by LinnW(1048) $\"\"$ $\"About$

You can put this solution on YOUR website!
x - 5y = -5
\n" ); document.write( "-2x - 4y = -4\r
\n" ); document.write( "\n" ); document.write( "Solve x -5y = -5 for x
\n" ); document.write( "add 5y to each side
\n" ); document.write( "x = 5y - 5
\n" ); document.write( "Substitute 5y - 5 for x in -2x - 4y = -4
\n" ); document.write( "-2(5y - 5) - 4y = -4
\n" ); document.write( "-10y + 10 -4y = -4
\n" ); document.write( "-14y + 10 = -4
\n" ); document.write( "add -10 to each side
\n" ); document.write( "-14y = -14
\n" ); document.write( "y = 1
\n" ); document.write( "substitute 1 for y in x - 5y = -5
\n" ); document.write( "x - 5(1) = -5
\n" ); document.write( "x -5 = -5
\n" ); document.write( "add 5 to each side
\n" ); document.write( "x = 0
\n" ); document.write( "Verify x - 5y = -5
\n" ); document.write( "0 - 5(1) = -5 , This checks.
\n" ); document.write( "Verify -2x - 4y = -4
\n" ); document.write( "-2(0) -4(1) = -4 , This checks.
\n" ); document.write( "So we have x = 0 and y = 1 \n" ); document.write( "

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