document.write( "Question 459179: I am still not getting this can anyone help me with this?\r
\n" ); document.write( "\n" ); document.write( "solve by elimination method
\n" ); document.write( "-7x+5y=-20
\n" ); document.write( "-3x-2y=8
\n" ); document.write( "I know that I am to multiply the first equation by 2 and the second equation by 5 which would give me -14x+10y=-4 and -15x-10y=40. Then I am to add them which would give me -29x=36 but I don't know where to go from there. Can someone help me please, thank you so much
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Algebra.Com's Answer #314919 by math-vortex(648)\"\" \"About 
You can put this solution on YOUR website!
I always appreciate when a student tells us what they've tried so far. Good work!
\n" ); document.write( "...
\n" ); document.write( "I see a small arithmetic error in your first equation. Multiplying the right side by 2 gives (2)(-20)=-40 so your new equation would be -14x+10x=-40.
\n" ); document.write( "...
\n" ); document.write( "Add the two equations,
\n" ); document.write( "\"-14x%2B10y=-40\"
\n" ); document.write( "\"-15x-10y=+40\"
\n" ); document.write( "to give,
\n" ); document.write( "\"-29x=0\"
\n" ); document.write( "Divide both sides by -29.
\n" ); document.write( "\"x=0\"
\n" ); document.write( "Now, substitute 0 for x into one of the original equations to find the y-value. It doesn't matter which one.
\n" ); document.write( "\"-7x%2B5y=-20\"
\n" ); document.write( "\"-7%280%29%2B5y=-20\"
\n" ); document.write( "\"5y=-20\"
\n" ); document.write( "\"y=-4\"
\n" ); document.write( "...
\n" ); document.write( "So, the solution to your system of equations is the order pair (0,-4). It's always a good idea to check your work for possible errors.
\n" ); document.write( "...
\n" ); document.write( "CHECK:
\n" ); document.write( "\"-7x%2B5y=-20\"
\n" ); document.write( "\"-7%280%29%2B5%28-4%29=-20\"
\n" ); document.write( "\"0-20=20\"
\n" ); document.write( "\"-20=-20\"
\n" ); document.write( "Good. Now check the other equation.
\n" ); document.write( "\"-3x-2y=8\"
\n" ); document.write( "\"-%280%29-2%28-4%29=8\"
\n" ); document.write( "\"8=8\"\r
\n" ); document.write( "\n" ); document.write( "Winner, winner, chicken dinner! (o:\r
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