समीकरणों (5x+6y=37) और (5x-2y=13) को हल करने पर (xy) का मान क्या है?
Solving (5x+6y=37) and (5x-2y=13), what is the value of (xy)?
Explanation opens after your attempt
A. (9)
Concept
This question needs careful substitution after elimination; careless cancellation gives a wrong value. Check each obtained value in both equations before marking.
Why this answer is correct
The correct answer is A. (9). This question needs careful substitution after elimination; careless cancellation gives a wrong value. Check each obtained value in both equations before marking.
Exam Tip
घटाने पर (8y=24), इसलिए (y=3) और \(x=\frac{19}{5}\) नहीं बल्कि दूसरे में रखने से \(x=\frac{19}{5}\) नहीं आता; सही हल (x=5,y=2) नहीं है, इसलिए सावधानी चाहिए।
Login to save your score, XP, coins and progress.
