document.write( "Question 838570: How do i do this problem using elimination? 3x+y=11, 4x-y=7 \n" ); document.write( "

Algebra.Com's Answer #505145 by brysca(112) $\"\"$ $\"About$

You can put this solution on YOUR website!
So by using elimination you're setting the two equations vertically like this.
\n" ); document.write( "3x+y=11
\n" ); document.write( "4x-y=7
\n" ); document.write( "And all you're doing is just adding the two equations together. Since y and -y cancel out you get
\n" ); document.write( "7x=18
\n" ); document.write( "x=18/7
\n" ); document.write( "And to solve for y, plug x into one of the equations
\n" ); document.write( " $\"3x%2By=11\"$
\n" ); document.write( " $\"3%2818%2F7%29%2By=11\"$
\n" ); document.write( " $\"54%2F7%2By=11\"$
\n" ); document.write( " $\"y=23%2F7\"$
\n" ); document.write( "x=18/7 and y=23/7 is your final answer
\n" ); document.write( "-Bryan \n" ); document.write( "

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