[tex] x_{M} = \frac{ x_{A} + x_{B} }{2} \ \textless \ =\ \textgreater \ 3 = \frac{ 4 + x_{B} }{2} \ \textless \ =\ \textgreater \ x_{B}=2 \\ y_{M} = \frac{ y_{A} + y_{B} }{2} \ \textless \ =\ \textgreater \ -5 = \frac{ -3 + y_{B} }{2} \ \textless \ =\ \textgreater \ y_{B}=-7[/tex]
