Yay, I love these.
We see the difference between all values in Y is 1/4.
Putting this into the base equation "y = mx + c" we put the 1/4 where m is.
So we get y=(1/4)x + c
Because this works and there is nothing to add we take out the C.
That means the answer is: y= (1/4)x
Please remember to give me 5 stars if I was helpful.