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x + y = 7 ਅਤੇ x - y = 3 ਜੋੜਨ ਨਾਲ ਕਿਹੜਾ ਵੇਰੀਏਬਲ ਖਤਮ ਹੋ ਜਾਂਦਾ ਹੈ?

Aਦੋਵੇਂ
Bਨਾ ਹੀ
Cਵਾਈ
Dਐਕਸ
Answer & Solution
Correct answer: C. ਵਾਈ
ਜਦੋਂ ਸਮੀਕਰਨਾਂ ਨੂੰ ਜੋੜਿਆ ਜਾਂਦਾ ਹੈ ਤਾਂ +y ਅਤੇ -y ਸ਼ਬਦ ਰੱਦ ਹੋ ਜਾਂਦੇ ਹਨ।
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