document.write( "Question 272133: 2y=4x+8
\n" ); document.write( "x-3y= -7 \n" ); document.write( "

Algebra.Com's Answer #199161 by oberobic(2304) $\"\"$ $\"About$

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2y = 4x +8
\n" ); document.write( "x - 3y = -7
\n" ); document.write( ".
\n" ); document.write( "rearranging
\n" ); document.write( "-4x + 2y = 8
\n" ); document.write( "x - 3y = -7
\n" ); document.write( ".
\n" ); document.write( "multiply the second equation by 4
\n" ); document.write( "4x - 12y = -28
\n" ); document.write( ".
\n" ); document.write( "so, we have
\n" ); document.write( "-4x + 2y = 8
\n" ); document.write( "4x - 12y = -28
\n" ); document.write( ".
\n" ); document.write( "add them
\n" ); document.write( "-10y = -20
\n" ); document.write( "y = 2
\n" ); document.write( ".
\n" ); document.write( "substitute
\n" ); document.write( "2(2) = 4x + 8
\n" ); document.write( "4 = 4x + 8
\n" ); document.write( "-4 = 4x
\n" ); document.write( "x = -1
\n" ); document.write( ".
\n" ); document.write( "checking
\n" ); document.write( "2(2) = 4(-1) + 8
\n" ); document.write( "4 = -4 + 8 = 4 TRUE
\n" ); document.write( ".
\n" ); document.write( "-1 -3(2) = -7 TRUE
\n" ); document.write( ".
\n" ); document.write( "Answer:
\n" ); document.write( "y = 2
\n" ); document.write( "x = -1 \n" ); document.write( "

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