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

asked Aug 11, 2021 110k views

5 votes

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

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6 votes

Answer:

Explanation:

Replace x

x=-y+21

2(-y+21)-15=y

Then solve the rest

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