समीकरण (4x+by=28) और (12x+21y=84) के अनंत हल होने के लिए (b) का मान क्या है?
What is the value of (b) for (4x+by=28) and (12x+21y=84) to have infinitely many solutions?
Explanation opens after your attempt
C. (7)
Concept
For infinitely many solutions, (4/12=b/21=28/84) must hold. Therefore, (b=7).
Why this answer is correct
The correct answer is C. (7). For infinitely many solutions, (4/12=b/21=28/84) must hold. Therefore, (b=7).
Exam Tip
अनंत हल के लिए (4/12=b/21=28/84) होना चाहिए। इसलिए (b=7) होगा।
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