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यदि बिन्दु (x, y),( – 5, 7) व (-4, 5) संरेख हैं तो सिद्ध कीजिए कि 2x + y + 3 = 0

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यदि बिन्दु (x, y), (-5, 7),(-4, 5) संरेख हैं तो त्रिभुज का क्षेत्रफल = 0

1/2 [(7x – 25 – 4y) – (-5y – 28 + 5x)] = 0

7x – 25 – 4y + 5y + 28 – 5x = 0

2x + y + 3 = 0

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