Question 4
What is the y-intercept of the line?

The y-intercept would be 1.

We know this because:

If you look at the line, and the y axis, we can look at where the line crosses through the y axis.

We know that the centre is (0,0).

We can see the line passes through the y axis one point above (0,0) so the answer would be

(0,1) which says y = 1

I hope this helps :)