To find the correlation coefficient (r-value) of the linear equation \( y = \frac{4}{3}x - 4 \), we can recognize that this equation represents a perfect linear relationship between \( x \) and \( y \).
In a perfect linear relationship, the correlation coefficient \( r \) is either:
- \( r = 1 \) if the relationship has a positive slope,
- \( r = -1 \) if the relationship has a negative slope.
Since the slope of your equation \( y = \frac{4}{3}x - 4 \) is positive (\(\frac{4}{3} > 0\)), the correlation coefficient is:
\[ r = 1 \]
Thus, the correlation coefficient \( r \) rounded to two decimal places is:
\[ \boxed{1.00} \]