The equation of angular bisector of the lines and is , which makes acute angle with x-axis then the value of is
The equations of angular bisectors of and are
To get the equation of angular bisectors of two perpendicular lines, add both equations for one angular bisector and subtract one from the other for other angular bisector.
Since the lines given are perpendicular to each other
The angular bisector is
The other angular bisector is
Observing the above two angular bisectors, the slope of is positive, hence this makes acute angle with x-axis.
Therefore,