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I NEED HELP PLEASE I DONT UNDERSTAND AND CANT FAIL

I NEED HELP PLEASE I DONT UNDERSTAND AND CANT FAIL-example-1

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Answer:

Explanation:

User Kevin Pope
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Answer:

D, 3y+1

Explanation:

Use the first equation because a variable is already isolated (alone)

Because x = 3y+1, and you are substituting x, the answer is D

User Max Imax
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