[tex] \frac{x1 + x2}{2} \: \: \frac{y1 + y2}{2} \\ [/tex]
[tex] \frac{4 + ( - 2)}{2} \: \: \: \frac{2 + ( - 4)}{2 } \\ [/tex]
[tex] \frac{4 - 2}{2} \: \: \frac{2 - 4}{2} \\ [/tex]
[tex] \frac{2}{2} \: \: \: \frac{ - 2}{2} \\ [/tex]
[tex] \: \: \: \: 1 \: \: \: \: \: \: - 1 \\ [/tex]
please mark this answer as brainlist