$x + y = 7$ और $x - y = 3$ को जोड़ने पर किस चर (variable) का विलोपन होता है?
Aदोनों
Bकोई भी नहीं
Cy
Dx
Answer & Solution
Correct answer: C. y
समीकरणों को जोड़ने पर $+y$ और $-y$ पद एक-दूसरे को निरस्त (cancel) कर देते हैं।
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