Calculate the gradient of the line l .
To calculate the gradient of a line, we need to determine the change in the y-coordinates divided by the change in the x-coordinates between two points on the line.
If we have the equation of the line in the form y = mx + c, where m is the gradient and c is the y-intercept, we can directly read off the gradient of the line.
If we have two points on the line, say (x1, y1) and (x2, y2), then the gradient of the line can be calculated as:
Gradient (m) = (y2 - y1) / (x2 - x1)
If we have the equation of the line in a different form, we can convert it to the form y = mx + c to find the gradient.
Once we have the values of y1, y2, x1, and x2, we can substitute them into the formula to find the gradient of the line.