2002 Cayley Problem 7

If the point \left(-2, 4\right) is on a line with slope \frac{1}{2}, then the y-intercept of this line is

\textbf{(A)}\ 5\quad \textbf{(B)}\ -4\quad \textbf{(C)}\ 3\quad \textbf{(D)}\ 0\quad \textbf{(E)}\ 8

If there are no answer choices shown, enter a numerical answer.

Full credit to this problem is given to the CEMC, you may view all Cayley contests here.