यदि (kx+2y=20) और (x+y=8) का हल (x=4,\ y=4) है, तो (k) का मान क्या है?

If (kx+2y=20) and (x+y=8) have solution (x=4,\ y=4), what is the value of (k)?

Explanation opens after your attempt
Correct Answer

A. (k=3)

Step 1

Concept

Substituting (x=4,\ y=4) gives (4k+8=20). Therefore (k=3).

Step 2

Why this answer is correct

The correct answer is A. (k=3). Substituting (x=4,\ y=4) gives (4k+8=20). Therefore (k=3).

Step 3

Exam Tip

(x=4,\ y=4) रखने पर (4k+8=20) मिलता है। इसलिए (k=3)।

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Mathematics Answer, Explanation and Revision Hints

यदि (kx+2y=20) और (x+y=8) का हल (x=4,\ y=4) है, तो (k) का मान क्या है? / If (kx+2y=20) and (x+y=8) have solution (x=4,\ y=4), what is the value of (k)?

Correct Answer: A. (k=3). Explanation: (x=4,\ y=4) रखने पर (4k+8=20) मिलता है। इसलिए (k=3)। / Substituting (x=4,\ y=4) gives (4k+8=20). Therefore (k=3).

Which concept should I revise for this Mathematics MCQ?

Substituting (x=4,\ y=4) gives (4k+8=20). Therefore (k=3).

What exam hint can help solve this Mathematics question?

(x=4,\ y=4) रखने पर (4k+8=20) मिलता है। इसलिए (k=3)।