document.write( "Question 184230: please help me solve each system of equation
\n" );
document.write( "1.) y=3x-4 2.) x-2y=-14 3.) x+2y=4 4.) 3x-y=2
\n" );
document.write( " y=-2x+1 y+2x=4 2x+y=-1 y=2x-5\r
\n" );
document.write( "\n" );
document.write( "and whats the solution?? \n" );
document.write( "
Algebra.Com's Answer #138322 by jeselle(2)![]() ![]() ![]() You can put this solution on YOUR website! by substitution: \n" ); document.write( "1.) \n" ); document.write( "y=3x-4 \n" ); document.write( "y=-2x+1 \n" ); document.write( "simply substitute the value of y in the second equation to the first \n" ); document.write( "-2x+1=3x-4 \n" ); document.write( "-2x-3x=-4-1 \n" ); document.write( "-5x=-5 \n" ); document.write( "(divide both sides by -5) \n" ); document.write( "x=1 \n" ); document.write( "by elimination \n" ); document.write( "-3x+y=-4 \n" ); document.write( " 2x+y=1 \n" ); document.write( "(subtract so that the sign of the subtrahend will be the opposite) \n" ); document.write( " -3x+y=-4 \n" ); document.write( " -1(2x+y=1)-1\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "-3x+y=-4 \n" ); document.write( "-2x-y=-1\r \n" ); document.write( "\n" ); document.write( "then add\r \n" ); document.write( "\n" ); document.write( "-5x=-5 \n" ); document.write( "x=1 \n" ); document.write( "do the same with the others and try practicing.^^ \n" ); document.write( " |