Question 665640
Hi Hannah;
You are given the straight line
(1) y = b which is a horizontal line that intersects the y axis at the point (0,b).
Since it is horizontal it is parallel to the x-axis. What do you know about parallel lines? They're just like railroad tracks, they never cross or intersect. So the line of (1) does NOT have any x-intercept. Unless b = 0, y is never zero, y is INDEPENDENT of x. See the points you are given? No matter what value x has, y is always equal to b.
As to your second question, I'm not too good at that sort of thing, but I would use
(2) range = {y|y = b}
PS You're not my Hannah Banana from St. Mary's are you?