Substitution method for solving linear pair of equations #shorts

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Excuse me miss where did the 19y come from?

MatthewBedah
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Ma'am jab 21 right side jagega tab vo 2 se subtract ho jaye toh - 19 aayega isliye answer -1 hoga

AnishaRawat-os
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What is the solution set for this system?

MuhammadAkla-vu