यदि (3x+2y=20) और (x-y=1), तो (3x-y) का मान क्या है?

If (3x+2y=20) and (x-y=1), what is the value of (3x-y)?

Explanation opens after your attempt
Correct Answer

D. (11)

Step 1

Concept

Using (x=y+1) gives (3y+3+2y=20), so \(y=\frac{17}{5}\) and \(x=\frac{22}{5}\). Then \(3x-y=\frac{49}{5}\).

Step 2

Why this answer is correct

The correct answer is D. (11). Using (x=y+1) gives (3y+3+2y=20), so \(y=\frac{17}{5}\) and \(x=\frac{22}{5}\). Then \(3x-y=\frac{49}{5}\).

Step 3

Exam Tip

(x=y+1) रखने पर (3y+3+2y=20), इसलिए \(y=\frac{17}{5}\) और \(x=\frac{22}{5}\)। तब \(3x-y=\frac{49}{5}\) है।

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Mathematics Answer, Explanation and Revision Hints

यदि (3x+2y=20) और (x-y=1), तो (3x-y) का मान क्या है? / If (3x+2y=20) and (x-y=1), what is the value of (3x-y)?

Correct Answer: D. (11). Explanation: (x=y+1) रखने पर (3y+3+2y=20), इसलिए \(y=\frac{17}{5}\) और \(x=\frac{22}{5}\)। तब \(3x-y=\frac{49}{5}\) है। / Using (x=y+1) gives (3y+3+2y=20), so \(y=\frac{17}{5}\) and \(x=\frac{22}{5}\). Then \(3x-y=\frac{49}{5}\).

Which concept should I revise for this Mathematics MCQ?

Using (x=y+1) gives (3y+3+2y=20), so \(y=\frac{17}{5}\) and \(x=\frac{22}{5}\). Then \(3x-y=\frac{49}{5}\).

What exam hint can help solve this Mathematics question?

(x=y+1) रखने पर (3y+3+2y=20), इसलिए \(y=\frac{17}{5}\) और \(x=\frac{22}{5}\)। तब \(3x-y=\frac{49}{5}\) है।