-7y+10x=140 7y+7x=-21 Solve for y

asked Oct 28, 2022 96.8k views

2 votes

-7y+10x=140
7y+7x=-21
Solve for y

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4 votes

Answer:

-10

Explanation:

add these two equations together to get rid of y. This gives you

x = 7

then plug x back into either equation and you can solve for y !

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