The straight lines 7x - 2y + 10 = 0 and 7x + 2y - 10 = 0 form an isosceles triangle with the line y = 2. The area of this triangle is equal to

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l5/7 sq. units

10/7 sq. units

18/7 sq. units

None of these

answer is C.

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Detailed Solution

We haveB≡67,2,C≡−67,2 or BC=127,AD=3∴ ΔABC=12×127×3=187 sq. units

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