With positive slope the line moves upward when ... This is a special case of a horizontal demand curve which says at any price ...
The slope of a line can be 'seen' to be sloping ... gradient\,of\,line\,EF = - \frac{2}{5}\) Horizontal lines have a gradient that is zero, ie they are not sloping uphill or downhill.
The National 4 section shows how to calculate the gradient of a slope using the vertical height and horizontal distance. A similar approach can be used for calculating the gradient of a line ...
One is the horizontal line Y=0, and the other is the fitted regression line with slope equal to the parameter estimate of the ...