The slope formula is:
[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]Where (x2,y2) is the rightmost point and (x1,y1) the other point to calculate the slope
The rightmost point in this case is (5,7) because 5 is greater than -3
So
[tex]\begin{gathered} m=\frac{7-3}{5-(-3)} \\ m=\frac{4}{5+3} \\ m=\frac{4}{8} \\ m=\frac{1}{2} \end{gathered}[/tex]