$\text{The slope of the line joining the points } (x_1,y_1) \text{ and } (x_2,y_2) \text{ is given by } m=\dfrac{y_2-y_1}{x_2-x_1}$.So, the slope of the line joining the points \(\left(9,-6\right)\) and \(\left(-10,-1\right)\) is \(\dfrac{\left(-1\right)-\left(-6\right)}{\left(-10\right)-\left(9\right)}\) = \(\dfrac{-1+6}{-10-9}\) = \(\dfrac{5}{-19}\) = \(-\dfrac{5}{19}\)The slope is negative, so the line is falling from left to right.