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lara31 [8.8K]
3 years ago
8

Ernesto tried to determine the solution for the system of equations using substitution. His work is shown below.

Mathematics
2 answers:
Blababa [14]3 years ago
6 0
I think its step 3 but i dont sure sorry
Tomtit [17]3 years ago
4 0
It is step 3 because 3(y+7) = 3y+21, so the 3 wasn't distributed to ALL of the values on the parentheses.
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