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
A. (k=3)
Concept
Substituting (x=4,\ y=4) gives (4k+8=20). Therefore (k=3).
Why this answer is correct
The correct answer is A. (k=3). Substituting (x=4,\ y=4) gives (4k+8=20). Therefore (k=3).
Exam Tip
(x=4,\ y=4) रखने पर (4k+8=20) मिलता है। इसलिए (k=3)।
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