a) Vẽ hai đường thẳng d : y = -6 - x và d1 : y = 2x - 4 trên cùng một mặt phẳng tọa độ Oxy:

\[
\begin{array}{c}
\text{Đường thẳng d:} y = -6 - x \\
\text{Đường thẳng d1:} y = 2x - 4
\end{array}
\]

\[
\begin{array}{|c|c|c|}
\hline
x & y_d = -6 - x & y_{d1} = 2x - 4 \\
\hline
-4 & -2 & -12 \\
-3 & -3 & -10 \\
-2 & -4 & -8 \\
-1 & -5 & -6 \\
0 & -6 & -4 \\
1 & -7 & -2 \\
2 & -8 & 0 \\
\hline
\end{array}
\]

Vẽ đồ thị:

\[
\begin{array}{c}
\text{Đường thẳng d (màu xanh): y = -6 - x} \\
\text{Đường thẳng d1 (màu đỏ): y = 2x - 4}
\end{array}
\]

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