1. Recognize that the question subtly tells you two points that the straight line passes through: its y-intercept and the point P(2,3). From this, calculate the gradient of the line and formulate the equation of the line.

2. Solve the equation of the line and the equation of the circle simultaneously to find two points of intersection - point P (already given to you) and the other point Q which you are supposed to find.

Hope this helps! Leave a comment if you still need clarifications / help!