document.write( "Question 1180511: Find the equation of the line which passes through point (1,1) and is perpendicular to line AB which passes through points A(1,-2) and B(5,6). \r
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Algebra.Com's Answer #810219 by mananth(16946)\"\" \"About 
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\n" ); document.write( "Find the equation of the line which passes through point (1,1) and is perpendicular to line AB which passes through points A(1,-2) and B(5,6). \r
\n" ); document.write( "\n" ); document.write( "Equation of AB\r
\n" ); document.write( "\n" ); document.write( "x1 y1 x2 y2
\n" ); document.write( "1 -2 5 6
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\n" ); document.write( "slope m = (y2-y1)/(x2-x1)
\n" ); document.write( "( 6 - -2 )/( 5 - 1 )
\n" ); document.write( "( 8 / 4 )
\n" ); document.write( "m= 2.00
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\n" ); document.write( "Plug value of the slope and point ( 1 , -2 ) in
\n" ); document.write( "Y = m x + b
\n" ); document.write( "-2.00 = 2 + b
\n" ); document.write( "b= -2.00 - 2
\n" ); document.write( "b= -4
\n" ); document.write( "So the equation of AB will be
\n" ); document.write( "Y = 2 x -4 \r
\n" ); document.write( "\n" ); document.write( "slope of the line = 2\r
\n" ); document.write( "\n" ); document.write( "The slope of a line perpendicular to the above line will be the negative reciprocal
\n" ); document.write( "m1*m2=-1
\n" ); document.write( "The slope of the required line will be 0.50
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\n" ); document.write( "m= 1/2 ,point ( 1 , 1 )
\n" ); document.write( "Find b by plugging the values of m & the point in -0.875
\n" ); document.write( "y=mx+b
\n" ); document.write( "2 = 1.75 + b
\n" ); document.write( "b= 0.25
\n" ); document.write( "m= -0.875
\n" ); document.write( "The required equation is y = - 7/8 x+ 1/4 \r
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