Question

http://prntscr.com/dj0916

Answer 1

@Will.H

Answer 2

@3mar

Answer 3

Well, I am here.

What is the meaning of x=0 and y=12??

Answer 4

@volleyballlover55
Do you follow?

Answer 5

1st we will have to pick 2 points again id addition to find the slope
(0,12)(1,21)
Slope = y2-y1/x2-x1
Slope = 9

and we know that the y intercept is when x = 0
Thus the y intercept would be 12
therefor the equation would be
y = 9x + 12

Answer 6

ok next...

http://prntscr.com/dj0kax

Answer 7

It would better to start your new question in another new post if you don't mind!
Can you?

Answer 8

ok