The slope - intercept form of two line equations are .
The above two lines are parallel, so their slopes are same.
\Therefore .
The slope - intercept form of line equation is perpendicular to the the above two line equations. \ \
The lines are perpendicular, so their slopes are negative reciprocals.
Therefore slope of perpendicular line is .
The slope - intercept form of two parallel lines are and the slope - intercept form of perpendicular line is
.