Give the slope and the $y$-intercept of the line with the given equation. Then, graph the linear equation. \[ y=\frac{4}{9} x \] Select the correct choice below and fill in any answer boxes within your choice. A. The slope is (Simplify your answer.) B. The slope is undefined.

Step 1 ：The equation of a line in slope-intercept form is given by \(y = mx + b\), where \(m\) is the slope and \(b\) is the y-intercept.

Step 2 ：In the given equation, \(y=\frac{4}{9} x\), we can see that the slope is \(\frac{4}{9}\) and the y-intercept is \(0\) (since there is no constant term).

Step 3 ：The graph of the line is a straight line that passes through the origin and has a positive slope.

Step 4 ：Final Answer: The slope of the line is \(\boxed{\frac{4}{9}}\) and the y-intercept is \(\boxed{0}\).