Gujarati
10-1.Circle and System of Circles
medium

दो वृत्त ${x^2} + {y^2} = 144$ तथा ${x^2} + {y^2} - 15x + 12y = 0$ के मूलाक्ष का समीकरण होगा

A

$15x - 12y = 0$

B

$3x - 2y = 12$

C

$5x - 4y = 48$

D

इनमें से कोई नहीं

Solution

(c) ${S_1} = 0$ व ${S_2} = 0$ का मूलाक्ष ${S_1} – {S_2} = 0$ है।

$\therefore \;{\rm{ }}({x^2} + {y^2} – 144) – ({x^2} + {y^2} – 15x + 12y) = 0$

$ \Rightarrow 15x – 12y – 144 = 0$

$\Rightarrow 5x – 4y = 48$.

Standard 11
Mathematics

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