The slope of first line is m 1= ( 1 - 0 ) / ( - 2 - ( - 6 ) ); m = 1 / 4 ; Because the second line is perpendicular to the first line, m2 * m1 = - 1 ; m2 * ( 1 / 4 ) = -1; m2 = - 4 ; The equation of the second line is : y - 3 = ( - 4 )( x - 2 ); y - 3 = -4x + 8 ; y = -4x + 11.