Cho hàm số y = 2 x a) Viết năm cặp số ( x ; y ) với x = − 2 ; − 1 ; 0 ; 1 ; 2 b) Biểu diễn các cặp số đó trên mặt phẳng tọa độ O x y ; c) Vẽ đường thẳng qua hai điểm ( − 2 ; − 4 ) ; ( 2 ; 4 ) . Kiểm tra bằng thước thẳng xem các điểm còn lại có nằm trên đường thẳng đó hay không?

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