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tamaranim1 [39]
3 years ago
9

X−3y=1x+y=9

Mathematics
2 answers:
Brrunno [24]3 years ago
7 0

I got this same question on a test, the answer is A.

Ksenya-84 [330]3 years ago
5 0

Answer:

Substitution Property of Equality

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