document.write( "Question 832113: solving systems by substitution
\n" ); document.write( "solve each system of equations using the substitution method. Check the solution.
\n" ); document.write( "x-7y=4
\n" ); document.write( "3x+y=-10 \n" ); document.write( "

Algebra.Com's Answer #501843 by mananth(16946) $\"\"$ $\"About$

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x-7y=4
\n" ); document.write( "3x+y=-10\r
\n" ); document.write( "\n" ); document.write( "x-7y=4\r
\n" ); document.write( "\n" ); document.write( "x=7y+4\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "3x+y=-10\r
\n" ); document.write( "\n" ); document.write( "3(7y+4)+y=-10\r
\n" ); document.write( "\n" ); document.write( "21y+12+y=-10\r
\n" ); document.write( "\n" ); document.write( "22y=-22
\n" ); document.write( "/22
\n" ); document.write( "y=-1
\n" ); document.write( "plug y in first equation\r
\n" ); document.write( "\n" ); document.write( "x-7y=4
\n" ); document.write( "x-7(-1)=4
\n" ); document.write( "x+7=4
\n" ); document.write( "x=-7+4
\n" ); document.write( "x=-3\r
\n" ); document.write( "\n" ); document.write( "x=-3
\n" ); document.write( "y=-1\r
\n" ); document.write( "\n" ); document.write( "Plug x& y in both equations to verify your answer\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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