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x + y = 7 અને x - y = 3 નો સરવાળો કરવાથી કયા ચલનો લોપ થાય છે?

Aબંને
Bએકપણ નહીં
Cy
Dx
Answer & Solution
Correct answer: C. y
જ્યારે સમીકરણોનો સરવાળો કરવામાં આવે છે ત્યારે +y અને -y પદો રદ થઈ જાય છે.
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