Question

can someone please help me with a few questions I really need help please.
((correct answers get a fan and medal))

Which of the following graphs represent a function? choose all that apply

Answer 1

a function is a relation such that for any given input (x), the independent value, there is only one output (y), the dependent value.

Answer 2

you can also apply what is called a line test. if the graph crosses a vertical line at more than one place then it is not a function. an example is option 2

Answer 3

im confused :/
so file 1 and file 4 is my correct answer? since file 2 is not a function???

Answer 4

no

Answer 5

there are 2 correct answers

Answer 6

at least read the criterion of a function and do the line test

Answer 7

okay

Answer 8

for the first file it's (1,1),(2,2),(-1,1),(-2,2),(-1,-1) ???
Did I do it right???