$\"\"$

The equation of the line is $\"\"$ .

Let the slope of the line be $\"\"$

Compare the equation of the line with the slope-intercept form $\"\"$ , where m = slope of the line and b = y-intercept.

Therefore $\"\"$ .

\ $\"\"$ \

Let the slope of another line be $\"\"$ .

If the two nonvertical lines are parallel, then their slopes are equal. That is $\"\"$ .

Therefore slope of the line parallel to the line $\"\"$ is also $\"\"$ .

$\"\"$

If the two nonvertical lines are perpendicular, then their slopes are negative reciprocals of each other. That is $\"\"$ .

Therefore slope of the line perpendicular to the line $\"\"$ is $\"\"$ .

$\"\"$

The slope of a parallel line is $\"\"$ and the slope of a perpendicular line is $\"\"$ .