If the original equation of the graph is \( y = \frac{2}{3}x \) and the graph is shifted 3 units up, you need to add 3 to the entire equation.
So, the equation becomes:
\[ y = \frac{2}{3}x + 3 \]
Therefore, the correct answer is:
y = \(\frac{2}{3}x + 3\) (y is equal to \( \frac{2}{3}x \) plus 3).