the point (8,4)divides the line joining (5,2)and (9,6)in ratio
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Correct question:-
The point (8, 4)divides the line joining (5, -2)and (9, 6) in ratio?
Given:-
- A(5, -2) = x₁, y₁
- B(9, 6) = x₂, y₂
- P(8, 4) = α, β
To find:-
- m : n
Answer:-
Let the ratio in which AB is divided be m : n.
We have to use the section formula for internal division. It says that,
If P(α, β) divides a line segment AB with A(x₁, y₁) and B(x₂, y₂) internally in the ratio m : n, then,
- α = [(mx₂ + nx₁) / (m + n)]
- β = [(my₂ + ny₁) / (m + n)]
Considering α
α = [(mx₂ + nx₁) / (m + n)]
→ 8 = [{(m * 9) + (n * 5)} / (m + n)]
→ 8 = [{9m + 5n} / (m + n)]
→ 8(m + n) = 9m + 5n
→ 8m + 8n = 9m + 5n
→ 9m - 8m = 8n - 5n
→ m = 3n
→ m : n = 3 : 1 Ans.
If we consider β then also we will get same ratio.
Considering β
β = [(my₂ + ny₁) / (m + n)]
→ 4 = [{(m * 6) + (n * -2)} / (m + n)]
→ 4 = [{6m - 2n} / (m + n)]
→ 4(m + n) = 6m - 2n
→ 4m + 4n = 6m - 2n
→ 6m - 4m = 4n + 2n
→ 2m = 6n
→ m = 3n
→ m : n = 3 : 1 Ans.
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