QUESTION 4 In the diagram, the circle centred at M(a; b) is drawn. T and R(6:0) are the z-interempts of the circle. A tangent is drawn to the circle at K(5 ; 7). 4,1 4.2 M(a; b) M is a point on the line y=x+1. 4.1.1 Write b in terms of a. 4.1.2 Calculate the coordinates of M. K(5:7) R(6;0) If the coordinates of M are (2;3), calculate the length of 4.2.1 The radius of the circle 4.2.2 TR 4.3 4.4 Determine the equation of the tangent to the circle at K. Write your answer in the form y=mx+C. A horizontal line is drawn as a tangent to the circle M at the point N(e; d), where d​