Chapter 8.5B, Problem 15A

To determine

a.

To explain:

The common thing in the equations $y=m\left(x-3\right)$, for different real number values of $m$.

To determine

b.

To explain:

The common thing in the equations $y=m\left(3-x\right)$, for different real number values of $m$.

To determine

c.

To explain:

The common thing in the equations $x-y=a$, for different real number values of $a$.

To determine

d.

To explain:

The common thing in the equations $y=m\left(x-1\right)+1$, for different real number values of $m$.