Slope of a straight line in complex form

Let the equation of a straight line L in complex form be abarz+baraz+b=0 , where is a complex number and b is a real number then

Straight line in complex plane

Slope of the straight line is ____.

Define slope of a straight line ?

In the distance-time graph, the slope of the straight line indicates

In the distance-time graph above, what does the slope of the straight line indicate?

What is slope of a straight line?

Is it possible to express, the equation of a straight line in slope-intercept form, when it is parallel to Y axis ?