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यदि बिंदु P(x, y), बिंदुओं A(7, 1) तथा B(3, 5) से समदूरस्थ है, तो x तथा y के बीच का संबंध ज्ञात कीजिए।

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बिंदु P(x, y), बिंदुओं A(7, 1) तथा B(3, 5) से समदूरस्थ है।

तो, AP = BP

दोनों तरफ वर्ग करने पर,

⇒ (AP)2 = (BP)2

दूरी सूत्र का उपयोग करके,

(x1​, y1​) और (x2​, y2​) के बीच की दूरी = \(\sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}\)    ....(1)

अब,

⇒ (AP)= (BP)2

⇒ (x − 7)2 + (y − 1)= (x − 3)2 + (y − 5)2         [समीकरण (1) से]

⇒ x2 + 49 − 14x + y2 + 1 − 2y = x2 + 9 − 6x + y+ 25 − 10y

⇒ −14x + 50 − 2y = −6x + 34 − 10y

⇒ −7x + 25 − y = −3x + 17 − 5y

⇒ −4x + 8 + 4y = 0

⇒ 4x − 4y = 8

⇒ 4(x − y) = 8

⇒ x − y = 2

अत: यह x और y के बीच का संबंध है।

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