SAT试题类型:Mathematics > Standard Multiple Choice Read the following SAT test question and then click on a button to select your answer. In the xy-plane, line l passes through the points (a, 0) and (0, 2a), where a > 1. What is the slope of line l? (A) -2 (B) -0.5 (C) 2 (D) -2a (E) 2a 答案:A 解析: Explanation Choice (A) is correct. Given two points on a line, the slope of the line can be found by dividing the change in the y-coordinates between the points by the corresponding change in the x-coordinates. Hence, since line l passes through the points (a, 0) and (0, 2a), its slope is

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