® Equation of the vertical line having distance b from the y -axis is either x = b or x = – b. ® The point ( x, y ) lies on the line with slope m and through the fixed point ( x o , y o ), if and only if its coordinates satisfy the equation y – y o = m ( x – x o ). ® Equation of the line passing through the points ( x , y ) and ( x , y ) is given by ). ® The point ( x , y ) on the line with slope m and y- intercept c lies on the line if and only if y = mx + c .
® If a line with slope m makes x- intercept d . Then equation of the line is y = m ( x – d ). ® Equation of a line making intercepts a and b on the x- and y -axis, respectively, is b