Physics/maths - A-Level

Will post a picture below
Honestly don't get what it is asking
Could someone explain to me please
Task:
The table below shows the formula for a particular physical relationship, and what has been plotted on the xx and yy axes. You should write down (in terms of the letters in the formula) what the y-intercept and gradient will be. If the graph is not going to be a straight line, write 'not straight' instead of a gradient.

Answer to number one (to maybe help you help me)
y-intercept is ϵ (epsilon) - don't even know what that means

I sort of get how to find the gradient
Would it just be like
change in y / change in x
so like i rearrange to get y / x then whats left is the gradient or what