document.write( "Question 329182: Solve each system by addition:\r
\n" ); document.write( "\n" ); document.write( "4x+3= -3y
\n" ); document.write( "-x/7 + 4y/21= 1\r
\n" ); document.write( "\n" ); document.write( "/ are fractions\r
\n" ); document.write( "\n" ); document.write( "I know the answer is (-3,3)
\n" ); document.write( "can you show me how to do that? \n" ); document.write( "

Algebra.Com's Answer #235879 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
(1) $\"4x%2B3=+-3y\"$
\n" ); document.write( "(2) $\"-x%2F7+%2B+4y%2F21=+1\"$
\n" ); document.write( "first, I will get (1) into the same form as (2)
\n" ); document.write( "(1) $\"+4x+%2B+3y+=+-3\"$
\n" ); document.write( "Then I multiply both sides of (2) by $\"21\"$
\n" ); document.write( "(2) $\"-3x+%2B+4y+=+21\"$
\n" ); document.write( "Now I multiply both sides of (1) by $\"3\"$
\n" ); document.write( "(1) $\"+12x+%2B+9y+=+-9\"$
\n" ); document.write( "Now I multiply both sides of (2) by $\"4\"$
\n" ); document.write( "(2) $\"-12x+%2B+16y+=+84\"$
\n" ); document.write( "Now I add (1) and (2)
\n" ); document.write( " $\"25y+=+75\"$
\n" ); document.write( " $\"y+=+3\"$
\n" ); document.write( "Then I substitute this result back into (1)
\n" ); document.write( "(1) $\"4x%2B3=+-3y\"$
\n" ); document.write( " $\"4x%2B3=+-3%2A3\"$
\n" ); document.write( " $\"4x+=+-3+-+9\"$
\n" ); document.write( " $\"4x+=+-12\"$
\n" ); document.write( " $\"x+=+-3\"$
\n" ); document.write( "The answer is (-3,3)\r
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