Note again that the slope is negative because the curve slopes down and to the right. Mathematically the slope of a curve is represented by rise over run or the change in the variable on the vertical axis divided by the change in the variable on the horizontal axis. And the slope of the curve is the quantity coefficient of the inverse function.
If the form of the equation is ymxc then the slope or gradient is just m.
Find the number in front of the x usually written as m to determine slope. This is a supplemental video that shows my students how to graph supply and demand equations. Insert the values into the linear demand. Note again that the slope is negative because the curve slopes down and to the right.