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if 2y+x+3=0 touches the circle 5X^2 + 5y^2=k

then k= ?

rani j , 14 Years ago
Grade 12
anser 1 Answers
Sanjeev Malik IIT BHU

Last Activity: 14 Years ago

x2+ y2 =k/5;  centre is (0,0). and radius = root(k/5).

as line touches circle so distance of line from centre equals the radius,

3/root(22+12)= root(k/5)

solving, k= 9

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