Biểu diễn miền nghiệm của bất phương trình trên cùng hệ trục

a) Để biểu diễn miền nghiệm của bất phương trình 2x+y≥1 trên hệ trục, ta cần vẽ đường thẳng 2x+y=1 và xác định vùng nằm phía trên hoặc bên trái đường thẳng đó.

Để vẽ đường thẳng 2x+y=1, ta có thể chọn hai điểm trên đường thẳng và nối chúng bằng một đường thẳng. Ví dụ, chọn điểm (0,1) và (1,-1), ta có:

Đường thẳng 2x+y=1

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