समीकरणों (7x+4y=45) और (7x-y=15) से (y) का मान ज्ञात कीजिए।
Find the value of (y) from (7x+4y=45) and (7x-y=15).
Explanation opens after your attempt
B. (y=6)
Concept
Subtracting the second equation from the first gives (5y=30). Therefore (y=6).
Why this answer is correct
The correct answer is B. (y=6). Subtracting the second equation from the first gives (5y=30). Therefore (y=6).
Exam Tip
पहले समीकरण से दूसरा घटाने पर (5y=30) मिलता है। इसलिए (y=6)।
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