Answer:
Slope=1/4
Explanation:
I'm so sorry, but I'm not sure what a constant of variation is. I can still help with the slope though!
To find slope from an ordered pair, subtract the y's, and then subtract the x's in the same order.
1-0=1
4-0 4
You can also do this the other way around.
0-1=-1=1
0-4 -4 4
As you can see, both ways of doing this result in the same slope.
Hope this helps you out!! Have a wonderful day :3