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Given:
P ≡ (x,y)
A ≡ (6,2)
B ≡ (-2,6)
To prove:
y = 2x
Proof:
It is given that, P is equidistant from A and B.
Thus, PA = PB
Now,
By distance formula,
PA = √ (6 - x)² + (2 - y)²
Thus, (PA)² = (6 - x)² + (2 - y)²
Also,
PB = √ (-2 - x)² + (6 - y)²
Thus, (PB)² = (-2 - x)² + (6 - y)²
But,
PA = PB
This implies, (PA)² = (PB)²
(6 - x)² + (2 - y)² = (-2 - x)² + (6 - y)²
Using the identity (a - b)² = a² + b² - 2ab, we get,
36 + x² - 2(6)(x) + 4 + y² - 2(2)(y) = 4 + x² + 2(2)(x) + 36 + y² - 2(6)(y)
- 12x - 4y = 4x - 12y
-12x - 4x = -12y + 4y
-16x = -8y
8y = 16x
On dividing both sides by 8, we get,
y = 2x
Hence, proved.
Hope it helps!!!
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