यदि (3x-4y=-2) और (5x+4y=34), तो (2x+y) का मान क्या है?
If (3x-4y=-2) and (5x+4y=34), what is the value of (2x+y)?
Explanation opens after your attempt
A. \(\frac{23}{2}\)
Concept
Adding both equations gives (8x=32), so (x=4). Then \(y=\frac{7}{2}\), hence \(2x+y=\frac{23}{2}\).
Why this answer is correct
The correct answer is A. \(\frac{23}{2}\). Adding both equations gives (8x=32), so (x=4). Then \(y=\frac{7}{2}\), hence \(2x+y=\frac{23}{2}\).
Exam Tip
दोनों समीकरण जोड़ने पर (8x=32), इसलिए (x=4)। फिर \(y=\frac{7}{2}\), अतः \(2x+y=\frac{23}{2}\)।
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