Find the distance of the point (-1, 1) from the line 12(x + 6) = 5(y - 2) ?

  1. 7
  2. 9
  3. 5
  4. None of these

Answer (Detailed Solution Below)

Option 3 : 5
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NDA 01/2025: English Subject Test
30 Qs. 120 Marks 30 Mins

Detailed Solution

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CONCEPT:

The perpendicular distance d from P (x1, y1) to the line ax + by + c = 0 is given by 

CALCULATION:

Here, we have to find the distance of the line 12(x + 6) = 5(y -2) from the point (- 1, 1)

The given equation of line can be re-written as: 12x - 5y + 82 = 0

Let P = (-1, 1)

⇒ x1 = - 1 and y1 = 1

Here, a = 12 and b = - 5

Now substitute  x1 = - 1 and y1 = 1 in the equation 12x - 5y + 82 = 0, we get

⇒ |12⋅ x1 - 5 ⋅ y1 + 82| = |- 12 - 5 + 82| = 65

⇒ 

As we know that, the perpendicular distance d from P (x1, y1) to the line ax + by + c = 0 is given by 

⇒ 

Hence, option C is the correct answer.

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