समीकरणों (4x+5y=39) और (2x-y=9) का हल कौन-सा है?
Which is the solution of (4x+5y=39) and (2x-y=9)?
Explanation opens after your attempt
A. (x=6,\ y=3)
Concept
Use (y=2x-9) from the second equation. Substitution gives (14x=84), so (x=6,\ y=3).
Why this answer is correct
The correct answer is A. (x=6,\ y=3). Use (y=2x-9) from the second equation. Substitution gives (14x=84), so (x=6,\ y=3).
Exam Tip
दूसरे समीकरण से (y=2x-9) रखें। पहले में रखने पर (14x=84), इसलिए (x=6,\ y=3)।
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