Find an Equation of the Line That Contains the Given $\mathbf{y}=\mathbf{m x}+\mathbf{b}$

Multiple Choice

Find an equation of the line that contains the given pair of points. Write the equation in the form $\mathbf{y}=\mathbf{m x}+\mathbf{b}$ .
- $(2,-7)$ and $(9,-7)$

A) $x=2$
B) $x=-7$
C) $y=-7$
D) $y=9$