Solve Matrix

$$\left. \begin{array} { l } { \text { D Let } f ( x ) = x - 6 \text { and } g ( x ) = x + 7 \text { . Find each } } \\ { \left. \begin{array} { l l } { \text { a. } ( f g ) ( x ) } & { \text { b. } ( f g ) ( - 5 ) } \end{array} \right. } \end{array} \right.$$

Solve for x

$$x=-\frac{6}{f-1}$$

$$f\neq 1$$

Steps for Solving Linear Equation

Subtract x from both sides.

$$fx-x=-6$$

Combine all terms containing x.

$$\left(f-1\right)x=-6$$

Divide both sides by f-1.

$$\frac{\left(f-1\right)x}{f-1}=-\frac{6}{f-1}$$

Dividing by f-1 undoes the multiplication by f-1.

$$x=-\frac{6}{f-1}$$