The formula for determining the midpoint of a line is expressed as
[tex]\begin{gathered} \text{Midpoint = }\lbrack\frac{(x1\text{ + x2)}}{2},\text{ }\frac{(y1\text{ + y2)}}{2}\rbrack \\ \text{From the information given,} \\ x1\text{ = - 5, x2 = 9} \\ y1\text{ = - 3, y2 = 3} \\ \text{Midpoint = }\lbrack\frac{(-\text{ 5 + 9)}}{2},\text{ }\frac{(-\text{ 3 + 3)}}{2}\rbrack \\ \text{Midpoint = (- 2, 0)} \end{gathered}[/tex]