涉及一次函数的动态问题很广泛.不过.只要我们掌握一些有代表性的问题,就可以做到胸有成竹,得心应手了.一、面积问题例1(2013年·衢州)如图1,正方形ABCD的边长为4.P为正方形边上一个动点.沿A→D→C→B→A的路径匀速移动.设P点经过的路径的长为x,△APD的面积是y,则下列图象中能大致反映y与x的函数关系的是(). However, as long as we master some representative issues, we can do it with confidence.Table 1 area problem (2013 · Quzhou) As shown in Figure 1, the side of the square ABCD Length is 4. P is a moving point on the side of the square and moves at a constant speed along the path of A → D → C → B → A. Assuming that the length of the path traveled by point P is x and the area of ​​△ APD is y, the following images Can be roughly reflected in the functional relationship between y and x is ().