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Lines x+y=1 and 3y=x+3 intersect the ell...

Lines `x+y=1` and `3y=x+3` intersect the ellipse `x^(2)+9y^(2)=9` at the points P, Q, R. The area of the triangle PQR is

A

`(36)/(5)`

B

`(18)/(5)`

C

`(9)/(5)`

D

`(1)/(5)`

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