document.write( "Question 970254: What is the solution set of:\r
\n" ); document.write( "\n" ); document.write( "x - 4y = 8\r
\n" ); document.write( "\n" ); document.write( "y = -5x + 7\r
\n" ); document.write( "\n" ); document.write( "Thank you!
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Algebra.Com's Answer #592912 by thesvw(77)\"\" \"About 
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x - 4y = 8
\n" ); document.write( "y = -5x + 7\r
\n" ); document.write( "\n" ); document.write( "Substitute y to the first equation. \r
\n" ); document.write( "\n" ); document.write( "x -4(-5x+7) =8\r
\n" ); document.write( "\n" ); document.write( "x +20x -28 =8
\n" ); document.write( "21x = 36\r
\n" ); document.write( "\n" ); document.write( "x= 36/21\r
\n" ); document.write( "\n" ); document.write( "Substitute this x value to second equation to find the y value.
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