यदि (4x+2y=20) और (x+y=7), तो (x) का मान क्या है?
If (4x+2y=20) and (x+y=7), what is the value of (x)?
Explanation opens after your attempt
Correct Answer
C. (x=3)
Concept
The first equation becomes (2x+y=10); subtracting (x+y=7) gives (x=3). Divide by common factors first.
Why this answer is correct
The correct answer is C. (x=3). The first equation becomes (2x+y=10); subtracting (x+y=7) gives (x=3). Divide by common factors first.
Exam Tip
पहला समीकरण (2x+y=10) बनता है; इससे (x+y=7) घटाने पर (x=3)। पहले सामान्य गुणनखंड से भाग दें।
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