Chapter 8.4A, Problem 12A

Write the equation of each line in exercise 11.

For each of the following, find the slope, if exists of the line determined by the given pair of points.

a. $\left(4,3\right)$ and $\left(-5,0\right)$

b. $\left(\sqrt{5},2\right)$ and $\left(1,2\right)$

c. $\left(a,a\right)$ and $\left(b,b\right)$

d. $\left(\sqrt{5},2\right)$ and $\left(\sqrt{5},-2\right)$