The graph in the diagram has equation y=A+Be−kx .
The figure shows a Cartesian coordinate system with a horizontal x-axis and a vertical y-axis. A curve is plotted, starting at a point on the y-axis labeled '8'. The curve decreases as it moves to the right, passing through a point on the x-axis labeled '2'. A horizontal line is drawn at y=−1, which the curve approaches as x increases, indicating a horizontal asymptote. The equation of the curve is given as y=A+Be−kx .
Find the values of A , B and k .