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特殊点的坐标 —— 坐标轴上的点的坐标

y. ·. ·. 6. A. (0 , 6). 5. 4. ·. 3. B. (0,3). 2. 1. E. ·. -2. ·. C. (0,-3). -3. C. 特殊点的坐标 —— 坐标轴上的点的坐标. 归纳： x 轴上点 y 坐标为 0, 即（ x,0) ； y 轴上点 x 坐标为 0, 即（ 0,y) ；. x 轴上点 y 坐标为 0. y 轴上点 X 坐标为 0. D. (-2,0). (2,0). ·. O. x. -4. -3. -2. -1. 1. 2. 3. 4. -1.

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特殊点的坐标 —— 坐标轴上的点的坐标

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  1. y · · 6 A (0 , 6) 5 4 · 3 B (0,3) 2 1 E · -2 · C (0,-3) -3 C 特殊点的坐标——坐标轴上的点的坐标 • 归纳： • x轴上点y坐标为0,即（x,0)； • y轴上点 x 坐标为0,即（0,y)； x轴上点y坐标为0 y轴上点X坐标为0 D (-2,0) (2,0) · O x -4 -3 -2 -1 1 2 3 4 -1 例：已知点P（a+3，2-a）在y轴上， 则a=

  2. y • 对称点的坐标: • 归纳： • 关于“谁”对称，“谁”不变; • 关于x轴对称，x坐标不变;. • 关于y轴对称，y坐标不变; P(a,b) B(-a,b) 1 x 0 -1 1 -1 A(a,-b) 例：点P(2，3)关于x轴对称的点的坐标为( ， ), 关于y轴对称的点的坐标为( ， ).

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