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Hangham
2 năm trước
Bài 7: Cho hai đường thẳng: (d1): y = 2x – 1 và (d2): mx + y = 5. a) Với m = 1, tìm tọa độ giao điểm của hai đường thẳng trên. b) Tìm m để (d1) cắt (d2) tại 1 điểm thuộc góc phần tư thứ (III) của mặt phẳng tọa độ Oxy. Bài 8: Cho ba đường thẳng: (d1): y = x + 2, (d2): 2x – y = –1, (d3): y = 3x. Chứng minh: ba đường thẳng trên đồng quy. mn giúp mik vs mk cảm ơn
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