Please help me i’ll mark brainliest

It is a function because it doesn't have 2 inputs (do vertical line test)

Step-by-step explanation:

A function only has one input.

TIP: make sure no points connect. If they do, it's not a function.

hello from mrbilldoesmath!

answer:

x - 3

discussion:

x^2 - 9 = (x-3) (x+3)   so

(x^2-9)/ (x + 3) = x-3

you,

mrb

irrational, cannot