I don't know where you got those answers, but the actual equation that represents those points is: y = -1/2x + 11. None of those listed above are correct.
Answer: 8.954 x 10^-15
Step-by-step explanation:
i took a test with this question and this was the answer
Answer:
Yes the relationship is linear and given by:
(first option of your list)
Step-by-step explanation:
Yes, it is a linear expression. As we did in previous exercises, we calculate the difference between consecutive y values of the table, and write down the answers we get:
-7-(-2) = -7+2 = -5
-12-(-7) = -12 +7 = -5
-17 - (-12) = -17 + 12 = -5
We notice that all of them give "-5"
Now we evaluate the difference between consecutive x-values in a similar fashion:
-5 -(-9) = -5+9 = 4
-1-(-5) = -1+5 = 4
3-(-1) = 3+1 = 4
We see that they all give 4 as the difference.
That means that the rate of change 
This means that the slope (rate of change) of the line is "-5/4"
We can now use the general point-slope form to write the equation of the line, using the first pair of the table as our selected point, and using "-5/4" for the slope:

which is the first expression listed among your possible answer choices.
I know for a fact B is wrong, so you can mark that off. I got C.
Answer:
-1
Step-by-step explanation:
Pick two points on the line
(0,1) and ( 2,-1)
Using the slope formula
m = (y2-y1)/(x2-x1)
= ( -1 -1)/(2-0)
= -2/2
= -1