Use the Definition of a Logarithm to Solve Logarithmic Equations $\log _ { 9 } 7 + \log _ { 9 } x = 1$

Multiple Choice

Use the Definition of a Logarithm to Solve Logarithmic Equations
Solve the logarithmic equation. Be sure to reject any value that is not in the domain of the original logarithmic
expressions. Give the exact answer.
- $\log _ { 9 } 7 + \log _ { 9 } x = 1$

A) $\left\{ \frac { 9 } { 7 } \right\}$
B) $\left\{ \frac { 7 } { 9 } \right\}$
C) $\{ \sqrt [ 7 ] { 9 } \}$
D) $\left\{ \frac { 1 } { 7 } \right\}$