समीकरण (2x+qy=8) और (5x+10y=21) का अद्वितीय हल होने के लिए कौन-सी शर्त सही है?
Which condition is correct for (2x+qy=8) and (5x+10y=21) to have a unique solution?
Explanation opens after your attempt
B. \(q \ne 4\)
Concept
For a unique solution, \(2/5 \ne q/10\) must hold. Therefore, \(q \ne 4\) is the correct condition.
Why this answer is correct
The correct answer is B. \(q \ne 4\). For a unique solution, \(2/5 \ne q/10\) must hold. Therefore, \(q \ne 4\) is the correct condition.
Exam Tip
अद्वितीय हल के लिए \(2/5 \ne q/10\) होना चाहिए। इसलिए \(q \ne 4\) सही शर्त है।
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