Question

Enter the equation of the line in the form y=md where m is the slope

Answer 1

I think you were talking about the formula:

y = mx+b

y= 3(1)

or y=3

Answer 2

Find slope:
(3,6), (6,12)
(12-6)/(6-3) = 6/3 = 2
The slope is 2
Plug in it into equation
Final answer: y = 2x