समीकरणों (7x-2y=39) और (3x+2y=21) से (x+2y) का मान क्या है?
What is the value of (x+2y) from (7x-2y=39) and (3x+2y=21)?
Explanation opens after your attempt
A. (9)
Concept
Adding both equations gives (10x=60), so (x=6). Then \(y=\frac{3}{2}\), hence (x+2y=9).
Why this answer is correct
The correct answer is A. (9). Adding both equations gives (10x=60), so (x=6). Then \(y=\frac{3}{2}\), hence (x+2y=9).
Exam Tip
दोनों समीकरण जोड़ने पर (10x=60), इसलिए (x=6)। फिर \(y=\frac{3}{2}\), अतः (x+2y=9)।
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