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
Correct Answer

A. (9)

Step 1

Concept

Adding both equations gives (10x=60), so (x=6). Then \(y=\frac{3}{2}\), hence (x+2y=9).

Step 2

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).

Step 3

Exam Tip

दोनों समीकरण जोड़ने पर (10x=60), इसलिए (x=6)। फिर \(y=\frac{3}{2}\), अतः (x+2y=9)।

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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)?

Correct Answer: A. (9). Explanation: दोनों समीकरण जोड़ने पर (10x=60), इसलिए (x=6)। फिर \(y=\frac{3}{2}\), अतः (x+2y=9)। / Adding both equations gives (10x=60), so (x=6). Then \(y=\frac{3}{2}\), hence (x+2y=9).

Which concept should I revise for this Mathematics MCQ?

Adding both equations gives (10x=60), so (x=6). Then \(y=\frac{3}{2}\), hence (x+2y=9).

What exam hint can help solve this Mathematics question?

दोनों समीकरण जोड़ने पर (10x=60), इसलिए (x=6)। फिर \(y=\frac{3}{2}\), अतः (x+2y=9)।