If the image of a positive scale function passes through a point (- 1,2), then the image must pass through a point () A. （1，2）B. （-1，-2）C. （2，-1）D. （1，-2）

If the image of a positive scale function passes through a point (- 1,2), then the image must pass through a point () A. （1，2）B. （-1，-2）C. （2，-1）D. （1，-2）

Let the analytic expression of the positive scale function be y = KX (K ≠ 0), because the image of the positive scale function y = KX passes through the point (- 1, 2), so 2 = - K. the solution is k = - 2, so y = - 2x. Substitute the coordinates of the points in the four options into y = - 2x, and the point where the equal sign holds is on the image of the positive scale function y = - 2x, so the image must pass through the point (1, - 2)