The slope of the line that passes through the points (x1, y1) and (x2, y2) is computed as follows:
[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]In this case, the line passes through the points (1,5) and (9,8), then its slope is:
[tex]m=\frac{8-5}{9-1}=\frac{3}{8}[/tex]