document.write( "Question 105005This question is from textbook McDougal Littell Algebra 2
\n" ); document.write( ": Solve the system using any algebraic method:
\n" ); document.write( "7x+5y=-12
\n" ); document.write( "3x-4y=1 \n" ); document.write( "
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7x+5y=-12
\n" ); document.write( "3x-4y=1
\n" ); document.write( "===============
\n" ); document.write( "We will go ahead and use elimination;
\n" ); document.write( "Multiply first equation by 4;
\n" ); document.write( "28x+20y=-48
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\n" ); document.write( "Now the second equation by 5;
\n" ); document.write( "15x-20y=5
\n" ); document.write( "====================
\n" ); document.write( "now add each together;
\n" ); document.write( "28x+20y=-48
\n" ); document.write( "15x-20y=5
\n" ); document.write( "--------------
\n" ); document.write( "43x=-43
\n" ); document.write( "x=-1
\n" ); document.write( "Now plug that answer into either original equation forx;
\n" ); document.write( "3(-1)-4y=1
\n" ); document.write( "-3-4y=1
\n" ); document.write( "-4y=4
\n" ); document.write( "y=-1
\n" ); document.write( "answer; x=-1, y=-1
\n" ); document.write( ":)\r
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