Slope is a measure of how steep a line it.
It is measured as "rise"/"run" or in Cartesian co-ordinate terms Δy/Δx and measures the cange in y by comparison to the change in x.
It is also the tan of the angle between the line and the x-axis in Cartesian co-ordinates.
The slope intercept form of the equation of a straight line (y = mx +b), m is the slope.
In a "real world" situation, the tangent of the angle on inclination is the same as the slope, e.g. you view the top of a tree (or a building or a monument) and measure the angle of inclination from your eye; the tangent (tan, for short) of that angle is the slope of the line.
I hope this helps. Please send me a message with any further specific questions.
