In the figure above, which of the following expressions can be used to calculate the slope of line $latex \overline{AB} &s=1$?

1. $latex \dfrac{2-1}{-4+3} &s=1$ (check answer)
2. $latex \dfrac{2+4}{1+3} &s=1$ (check answer)
3. $latex \dfrac{-4+3}{2-1} &s=1$ (check answer)
4. $latex \dfrac{1+3}{2+4} &s=1$ (check answer)
5. $latex \dfrac{1-3}{2-4} &s=1$ (check answer)

Solutions, hints, and questions are welcomed. A full solution will be posted on September 21st. If you would like to learn how to enter math formulas into this blog, visit the WordPress LaTeX tutorial page.