समीकरण (y=3x) और (x+y=16) का हल कौन-सा है?
Which is the solution of (y=3x) and (x+y=16)?
Explanation opens after your attempt
B. ( (4,12) )
Concept
Putting (y=3x) gives (4x=16), so (x=4) and (y=12). Substitution is fast when one variable is a multiple of the other.
Why this answer is correct
The correct answer is B. ( (4,12) ). Putting (y=3x) gives (4x=16), so (x=4) and (y=12). Substitution is fast when one variable is a multiple of the other.
Exam Tip
(y=3x) रखने पर (4x=16), इसलिए (x=4) और (y=12)। अनुपात वाले समीकरण में प्रतिस्थापन तेज होता है।
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