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Does anyone know how to use substitution for x+y=21 2x-15=y
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5 votes
Does anyone know how to use substitution for
x+y=21
2x-15=y

User Koen Meijer
by
5.8k points

1 Answer

6 votes

Answer:

Explanation:

Replace x

x=-y+21

2(-y+21)-15=y

Then solve the rest

User Dave Hirschfeld
by
5.2k points
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