document.write( "Question 400011: Could someone please explain how to do these problems, we are solving problems with two variables and I do not understand how to even start working on them, the directions state...Solve by the addition-or-subtraction method, if someone could explain how they are solved I think I could get it....\r
\n" ); document.write( "\n" ); document.write( "3x-y=-5
\n" ); document.write( "2x+2y=-6\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "I would greatly appreciate it...thanks!!!! \n" ); document.write( "

Algebra.Com's Answer #283228 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!


\n" );
document.write( "Hi
\n" );
document.write( "Solving by the addition-or-subtraction method is the result of:
\n" );
document.write( "eliminating one variable when adding or subtrating the two equations
\n" );
document.write( "3x - y = -5   |Sets Up for eliminating y by adding the two equation
\n" );
document.write( "2x + 2y = -6 \r
\n" );
document.write( "\n" );
document.write( "3x - y = -5   |dividing 2nd equation by 2 prior to adding the equations
\n" );
document.write( " x + y = -3 
\n" );
document.write( "Adding the two equations together
\n" );
document.write( "  4x  = -8
\n" );
document.write( "   x = -2  
\n" );
document.write( "Substituting x-value in one the equations to find y-value
\n" );
document.write( "   x + y = -3
\n" );
document.write( "  -2 + y = -3
\n" );
document.write( "       y = -1 \n" );
document.write( "

\n" );