Can y’all do 1-2 i’ll give brainliest !

One to one or injective means that each x in the domain maps to a unique y, i.e. the function preserves distinction.

y=(x-1)/(3x+3) is one to one.  We can solve for x:

3xy + 3y = x - 1

3y + 1 = x - 3xy = x(1-3y)

x = (3y+1)/(1-3y)

That proves it's one-to-one; for each y we get one x.

That's also one to one,

That's the proof.

That's Not one-to-one

because f(-x)=f(x).  We only need a single counterexample; f(1)=7/4, f(-1)=7/4

That's one-to-one, textbook case

That's not one-to-one because the fourth power dominates so this will be sort of parabola-ish, repeating the same big positive values for a negative and positive x.

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First choice

your answer is the frist one

hop i