Respuesta :

itsyogirlrachel

The answer is the first one:

bc its not growing by a (-)1/2  and the 3rd one just doesnt make sense
The vertex form is y = x
Standard form is x + y = number
Move x to the other side
-x + y = 0
The coefficient on x cannot be negative so multiply the whole equation by -1.
x - y = 0

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