document.write( "Question 153486: Find the equation of the line passing through the points ( - 4, 8) and (5, -1).\r
\n" ); document.write( "\n" ); document.write( "Also find the equation of the straight line perpendicular to the line you find above and passing through the point ( -3, -8).
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Algebra.Com's Answer #112981 by checkley77(12844)\"\" \"About 
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(-4,8) (5,-1)
\n" ); document.write( "slope=(y2-y1)/(x2-x1)
\n" ); document.write( "(-1-8)/(5+4)=-9/8 slope.
\n" ); document.write( "Y=mX+b
\n" ); document.write( "8=-9/8*-4+b
\n" ); document.write( "8=36/8+b
\n" ); document.write( "8=9/2+b
\n" ); document.write( "b=9-9/2
\n" ); document.write( "b=9/2 THE Y INTERCEPT.
\n" ); document.write( "Y=-9X/8+9/2 (RED LINE)
\n" ); document.write( "THE PERPENDICULAR LINE HAS A SLOPE=8/9 THROUGH (-3,-8)
\n" ); document.write( "-8=8/9*-3+b
\n" ); document.write( "-8=-24/9+b
\n" ); document.write( "b=-8+24/9
\n" ); document.write( "b=(-8*9+24)/9
\n" ); document.write( "b=(-72+24)/9
\n" ); document.write( "b=-48/9=-16/3
\n" ); document.write( "Y=8X/9-16/3 (GREEN LINE)
\n" ); document.write( "\"+graph%28+300%2C+200%2C+-6%2C+5%2C+-10%2C+10%2C+-9X%2F8+%2B9%2F2%2C+8X%2F9+-16%2F3%29+\" (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions -9X/8 +9/2 and 8X/9 -16/3). \r
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