document.write( "Question 533995: Solve this problem by usonf the system.of substitution.\r
\n" ); document.write( "\n" ); document.write( "x-4y=4
\n" ); document.write( "6x-3y= -18\r
\n" ); document.write( "\n" ); document.write( "Help!! \n" ); document.write( "

Algebra.Com's Answer #351221 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
(1) $\"+x+-+4y+=+4+\"$
\n" ); document.write( "(2) $\"+6x+-+3y+=+-18+\"$
\n" ); document.write( "Divide both sides by $\"3\"$
\n" ); document.write( "(2) $\"+2x+-+y+=+-6+\"$
\n" ); document.write( "----------------
\n" ); document.write( "Solve (1) for $\"x\"$
\n" ); document.write( "(1) $\"+x+=+4+%2B+4y+\"$
\n" ); document.write( "Substitute this into (2)
\n" ); document.write( "(2) $\"+2%2A%284+%2B+4y%29+-+y+=+-6+\"$
\n" ); document.write( "(2) $\"+8+%2B+8y+-+y+=+-6+\"$
\n" ); document.write( "(2) $\"+7y+=+-6+-+8+\"$
\n" ); document.write( "(2) $\"+7y+=+-14+\"$
\n" ); document.write( "(2) $\"+y+=+-2+\"$
\n" ); document.write( "and, since
\n" ); document.write( "(2) $\"+2x+-+y+=+-6+\"$
\n" ); document.write( "(2) $\"+2x+-+%28-2%29+=+-6+\"$
\n" ); document.write( "(2) $\"+2x+%2B+2+=+-6+\"$
\n" ); document.write( "(2) $\"+2x+=+-8+\"$
\n" ); document.write( "(2) $\"+x+=+-4+\"$
\n" ); document.write( "The solution $\"+x+=+-4+\"$ , $\"+y+=+-2+\"$
\n" ); document.write( "It's easy to verify this with a plot of the equations:
\n" ); document.write( " $\"+graph%28+400%2C+400%2C+-10%2C+10%2C+-10%2C+10%2C+%281%2F4%29%2Ax+-+1%2C+2x+%2B+6+%29+\"$ \n" ); document.write( "

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