Evaluate (complex solution)
\frac{y_{2}-y_{1}}{x_{2}-x_{1}}=-\frac{1}{2}\text{ and }m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}
Solve for y_2
y_{2}=\frac{x_{1}}{2}-\frac{x_{2}}{2}+y_{1}
x_{2}\neq x_{1}\text{ and }m=-\frac{1}{2}
Solve for y_1
y_{1}=\frac{x_{2}}{2}-\frac{x_{1}}{2}+y_{2}
x_{2}\neq x_{1}\text{ and }m=-\frac{1}{2}
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