"she looks at me with her twin vision, trying to read me" guys what part of figurative language is that? metaphor?

what lesson are you referencing?

this is hard!  

did you get the answer?

. a function is a relation in which each input has only one output. in the relation , y is a function of x, because for each input x (1, 2, 3, or 0), there is only one output y. x is not a function of y, because the input y = 3 has multiple outputs: x = 1 and x = 2.