Chapter 10.2, Problem 11E

Find the slopes of the lines containing:

a) $\left(2, -3\right)$ and $\left(4, 5\right)$

b) $\left(3, -2\right)$ and $\left(3, 7\right)$

c) $\left(1, -1\right)$ and $\left(2, -2\right)$

d) $\left(-2.7, 5\right)$ and $\left(-1.3, 5\right)$

e) $\left(a, b\right)$ and $\left(c, d\right)$

f) $\left(a, 0\right)$ and $\left(0, b\right)$