(a) Solve for x and y in the following equations :

\(2x - y = \frac{9}{2}\)

\(x + 4y = 0\)

(b) In the diagram, TA is a tangent to the circle at A. If \(\stackrel\frown{BCA} = 40°\) and \(\stackrel\frown{DAT} = 52°\), find \(\stackrel\frown{BAD}\).