Q. 25

# Find the image of

Given: Equation of line is To find: image of point (5, 9, 3)

Formula Used: Equation of a line is

Vector form: Cartesian form: where is a point on the line and with b1 : b2 : b3 being the direction ratios of the line.

If 2 lines of direction ratios a1:a2:a3 and b1:b2:b3 are perpendicular, then a1b1+a2b2+a3b3 = 0

Mid-point of line segment joining (x1, y1, z1) and (x2, y2, z2) is Explanation:

Let So the foot of the perpendicular is (2λ + 1, 3λ + 2, 4λ + 3)

The direction ratios of the perpendicular is

(2λ + 1 - 5) : (3λ + 2 - 9) : (4λ + 3 - 3)

(2λ – 4) : (3λ – 7) : (4λ)

Direction ratio of the line is 2 : 3 : 4 From the direction ratio of the line and the direction ratio of its perpendicular, we have

2(2λ – 4) + 3(3λ – 7) + 4(4λ) = 0

4λ – 8 + 9λ – 21 + 16λ = 0

29λ = 29

λ = 1

So, the foot of the perpendicular is (3, 5, 7)

The foot of the perpendicular is the mid-point of the line joining (5, 9, 3) and (α, β, γ)

So, we have   So, the image is (1, 1, 11)

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