समीकरणों (5x+dy=40) और (20x+28y=160) के अनंत हल होने के लिए (d) का मान क्या है?
What is the value of (d) for the equations (5x+dy=40) and (20x+28y=160) to have infinitely many solutions?
Explanation opens after your attempt
C. (7)
Concept
For infinitely many solutions, (5/20=d/28=40/160) must hold. Therefore, (d=7).
Why this answer is correct
The correct answer is C. (7). For infinitely many solutions, (5/20=d/28=40/160) must hold. Therefore, (d=7).
Exam Tip
अनंत हल के लिए (5/20=d/28=40/160) होना चाहिए। इसलिए (d=7)।
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