The slope of a line in the plane containing the x and y axes is generally represented by the letter m and is defined as the change in the y coordinate divided by the corresponding change in the x coordinate between two distinct points on the line. Find tan-1 -1 Type -1 and use the tan-1 key on a scientific calculator. Zero slope on the other hand means that the line is horizontal ie.
In analytic geometry the slope of any line ray or line segment is the ratio of the vertical to the horizontal distance between any two points on it slope equals rise over run.
For slope it tends to be kids putting it upside-down or messing up the negatives. Slope is the steepness of the line also commonly known as rise over run. The direction can be either positive or negative. You will see that tan-1 1 -45 degrees As you can see -45 degrees is not the 135 degrees.