north to south
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North and south
East to west. The north to south lines intersect at the poles.
you look at how much it goes up and call that the rise and how much it goes in the horizontal direction call the run. Slop is rise divided by run.
The gradient of a function, in a given direction, is the change in the value of the function per unit change in the given direction. It is, thus, the rate of change of the function, with respect to the direction. It is generally found by calculating the derivative of the function along the required direction. For a straight line, it is simply the slope. That is the "Rise" divided by the "Run".
The slope between any two points in a plane is the ratio of the difference in the vertical direction (the rise) and the difference in the horizontal direction (the run). Since it is a ratio, the difference in the horizontal direction may not be zero. However, the slope of a vertical line is considered to be "infinite". With that qualification, the slope between any two points on a plane can have any real value.The slope between any two distinct points on a graph is as defined above. The slope at a single point is defined only if the relevant function is differentiable at that point and it is the slope of the tangent to graph at that point.