$\text{The slope of the line joining the points } (x_1,y_1) \text{ and } (x_2,y_2) \text{ is given by } m=\dfrac{y_2-y_1}{x_2-x_1}$.So, the slope of the line joining the points \(\left(-8,2\right)\) and \(\left(-7,3\right)\) is \(\dfrac{\left(3\right)-\left(2\right)}{\left(-7\right)-\left(-8\right)}\) = \(\dfrac{3-2}{-7+8}\) = \(\dfrac{1}{1}\)The slope is positive, so the line is rising from left to right.