Answer:
Assume x is directly proportional to y :

when y is 9, x is 2:
substitute to find value of k :

Therefore, equation is:

Answer:
we can only give brainliest if we ourselves have asked the a question ( to which she/he answered)
Answer:
7. is 2 squared. I didn't show my work but I am very sure that's the answer.
Answer is a. (2,2)
Because for it to be a function each x value can only have one y value. And in the chart it says x is 2 and 8