The equation is .

Solve by algebraically.

Apply subtraction property of equality: Subtract 3 from each side.

                            (Simplify)

Apply division property of equality: Divide each side by 9.

                            (Cancel common terms)

                           (Divide: )

The solution is .

Solve by graphing.

The equation is .

The related function is .

To graph the function make a table

Draw a table \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \

\ x \	\ f(x) = 9x + 3 \	\ f(x) \	\ (x, f(x)) \
\ 1 \	\ = 9(1) + 3  \	\    12 \	\ (1, 12) \
\        2 \	\ = 9(2) + 3 \	\ 21 \	\ (2, 21) \

\

Use these ordered pairs to graph the equation.

1.      Draw a coordinate plane.

2.      Plot the points.

3.      Draw a line through these points.

The graph intersects the x axis at , hence the solution is .

The root of the equation is . \ \