using the formula for the slope between 2 points
[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]name point 1 (18,3) and point 2 (24,4)
replace on the formula
[tex]\begin{gathered} m=\frac{4-3}{24-18} \\ m=\frac{1}{6} \end{gathered}[/tex]The slope between the ordered pairs will be 1/6