समीकरणों (7x-3y=20) और (2x+y=9) का हल कौन-सा है?
Which is the solution of (7x-3y=20) and (2x+y=9)?
Explanation opens after your attempt
B. (x=3,\ y=3)
Concept
From the second equation use (y=9-2x). Substituting in the first gives (13x=39), so (x=3,\ y=3).
Why this answer is correct
The correct answer is B. (x=3,\ y=3). From the second equation use (y=9-2x). Substituting in the first gives (13x=39), so (x=3,\ y=3).
Exam Tip
दूसरे समीकरण से (y=9-2x) रखें। पहले समीकरण में रखने पर (13x=39), इसलिए (x=3,\ y=3)।
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