Hey! it would be a great if someone could me with questions 6-9. i've put what i believe to be an appropriate amount of points and i'm more than willing to mark the most answer brainliest! if you can't with all of them that's completely fine just any would be awesome!

Number 6 is B because each input or x value has one output or y value
Number 7 is C because that’s not even an equation
Number 8 is D because each input or x value has one output or y value
Number 10 is A because if you graph it all of the points would be on a line increasing proportionally
(Hopefully this made sense I tried my best)