समीकरणों (2x+3y=21) और (x+y=8) में (y) का मान क्या होगा?

In (2x+3y=21) and (x+y=8), what will be the value of (y)?

Explanation opens after your attempt
Correct Answer

C. (y=5)

Step 1

Concept

Using (x=8-y) gives (16-2y+3y=21), so (y=5). It is useful to isolate (x) from the smaller equation.

Step 2

Why this answer is correct

The correct answer is C. (y=5). Using (x=8-y) gives (16-2y+3y=21), so (y=5). It is useful to isolate (x) from the smaller equation.

Step 3

Exam Tip

(x=8-y) रखने पर (16-2y+3y=21), इसलिए (y=5)। छोटे समीकरण से (x) अलग करना उपयोगी है।

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Mathematics Answer, Explanation and Revision Hints

समीकरणों (2x+3y=21) और (x+y=8) में (y) का मान क्या होगा? / In (2x+3y=21) and (x+y=8), what will be the value of (y)?

Correct Answer: C. (y=5). Explanation: (x=8-y) रखने पर (16-2y+3y=21), इसलिए (y=5)। छोटे समीकरण से (x) अलग करना उपयोगी है। / Using (x=8-y) gives (16-2y+3y=21), so (y=5). It is useful to isolate (x) from the smaller equation.

Which concept should I revise for this Mathematics MCQ?

Using (x=8-y) gives (16-2y+3y=21), so (y=5). It is useful to isolate (x) from the smaller equation.

What exam hint can help solve this Mathematics question?

(x=8-y) रखने पर (16-2y+3y=21), इसलिए (y=5)। छोटे समीकरण से (x) अलग करना उपयोगी है।

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