Cho hệ trục tọa độ Oxy và điểm $I(1;-2)$.
a) Viết công thức chuyển trục từ hệ tọa độ Oxy sang hệ mới gốc là điểm $I$.
b) Tìm tọa độ các điểm $A(-3;4), B(3;-2), C(1;5)$ trong hệ tọa độ IXY.
a) Ta có: $\begin{cases}x= 1 + X \\ y=-2 + Y \end{cases}     \Rightarrow  \begin{cases}X = x -1 \\ Y= y+ 2\end{cases}$

b) Từ đây ta được tọa độ của $A$ trong hệ tọa độ IXY là $A(-4; 6)$.
Tương tự ta có:   $B(2;0),    C(0;7)$.

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