Summary: With the help of activity in screen 5, we have learnt that:
We will get a unique line when one point through which it passes and its slope are given. Moreover, the equation of this line will be y-y1=m(x-x1), where m is slope of the line and x1, y1 are the co-ordinates of the point through which this line passes. (Slope = tanα where α is the angle between the line and positive x axis.)
To get a unique line we need two conditions. If only a point through which the line passes is given then we will get an infinite number of lines and same will be the case if only slope of the line is known.
