document.write( "Question 63880: Solve the system by substitution.
\n" ); document.write( " x + 4y = –4
\n" ); document.write( " 3x – 3y = –12
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Algebra.Com's Answer #44526 by checkley71(8403)\"\" \"About 
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X+4Y=-4
\n" ); document.write( "X=-4Y-4 REPLACE X BY (-4Y-4) IN THE SECOND EQUATION
\n" ); document.write( "3(-4Y-4)-3Y=-12
\n" ); document.write( "-12Y-12-3Y=-12
\n" ); document.write( "-15Y=0
\n" ); document.write( "Y=0 SOLUTION
\n" ); document.write( "X=-4*0-4
\n" ); document.write( "X=-4 SOLUTION\r
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