document.write( "Question 280032: solve the linear system
\n" ); document.write( "-7x-8y=9
\n" ); document.write( "-4x+9y=-22\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
Algebra.Com's Answer #203591 by checkley77(12844)\"\" \"About 
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-7x-8y=9 multiply by 9
\n" ); document.write( "-4x+9y=-22 multiply by 8 & add.
\n" ); document.write( "-63x-72y=81
\n" ); document.write( "-32x+72y=-176
\n" ); document.write( "--------------
\n" ); document.write( "-95x=-95
\n" ); document.write( "x=-95/-95
\n" ); document.write( "x=1 ans.
\n" ); document.write( "-7*1-8y=9
\n" ); document.write( "-7-8y=9
\n" ); document.write( "-8y=9+7
\n" ); document.write( "-8y=16
\n" ); document.write( "y=16/-8
\n" ); document.write( "y=-2 ans.
\n" ); document.write( "SOLUTION: (1,-2)
\n" ); document.write( "-7x-8y=9
\n" ); document.write( "-8y=7x+9
\n" ); document.write( "y=7x/-8+9/-8
\n" ); document.write( "y=-7x/8-9/8 (red line)
\n" ); document.write( "-4x+9y=-22
\n" ); document.write( "9y=4x-22
\n" ); document.write( "y=4x/9-22/9 (green line)
\n" ); document.write( "\"+graph%28+300%2C+200%2C+-6%2C+5%2C+-10%2C+10%2C+-7x%2F8+-9%2F8+%2C+4x%2F9+-22%2F9+%29+\" (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions -7x/8 -9/8 and 4x/9 -22/9).
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