Hi there, im currently revising C1 (OCR) in preparation for the exam in January. Im revising circles at the moment but i am unsure what to do and where to begin with this question:
The straight line y=20−3x meets the circle at x2+y2−2x−14y=0 at the points A and B. Calculate the exact length of the chord AB.
I know the centre is (1,7) and the gradient of the line is -3 but other than that i dont know what to do next.