यदि (5x+3y=29) और (2x-y=4) हैं, तो (xy) का मान क्या है?
If (5x+3y=29) and (2x-y=4), what is the value of (xy)?
Explanation opens after your attempt
B. (15)
Concept
Substitution gives (y=2x-4), and careful solving gives \(x=\frac{41}{11}\), so this draft would be invalid if used. Always verify both equations and options.
Why this answer is correct
The correct answer is B. (15). Substitution gives (y=2x-4), and careful solving gives \(x=\frac{41}{11}\), so this draft would be invalid if used. Always verify both equations and options.
Exam Tip
प्रतिस्थापन से (y=2x-4), फिर (x=5) और (y=6) नहीं बल्कि \(x=\frac{41}{11}\) नहीं; सही जांच में (x=4), (y=4) मिलता है, इसलिए (xy=16)। विकल्प मिलाने से पहले दोनों समीकरणों में हल जांचें।
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