I am not able to see the picture
Finding gradient:
m = y2 - y1
x2 - x1
= -1 - 6
1 - 3
= -7 / (-2)
= 7/2
y = m(x - x1) + y1
y = 7(x - 3) + 6
2
2y = 7x - 21 + 12
2y = 7x - 9
Yes, it is a function.
Each element in the set called the domain is related to exactly one output in a set called the range.
A function can have several inputs that provide the same output, but a function should never have one input that results in multiple outputs.
Answers: #2, 3, 5, 6 are correct
... believe me, I juss did them.