समीकरणों (4x+ay=28) और (12x+15y=84) के अनंत हल होने के लिए (a) का मान क्या होगा?
What is the value of (a) for the equations (4x+ay=28) and (12x+15y=84) to have infinitely many solutions?
Explanation opens after your attempt
B. (5)
Concept
For infinitely many solutions, (4/12=a/15=28/84) must hold. Therefore, (a=5) is correct.
Why this answer is correct
The correct answer is B. (5). For infinitely many solutions, (4/12=a/15=28/84) must hold. Therefore, (a=5) is correct.
Exam Tip
अनंत हल के लिए (4/12=a/15=28/84) होना चाहिए। इसलिए (a=5) सही है।
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