Is this a function or not

(-3,4) (-2,4) (-1,4) (0,4) (1,4) (2,4) (3,4)

also... what would be the function rule of these functions of it was?

Yes, it is a function.

In every ordered pair you have one x coordinate and one y co-ordinate (x, y). You can have a y coordinate that repeats itself but you can never have an x co-ordinate that repeats itself. Since your x-coordinates do not repeat, you have a function.

The function rule is f(x)=4

If you pass a vertical line through the graph, is there anywhere that it touches two or more points (two or more points that share an x-coordinate)? If so, it's not a function. That's not the case here, so it is a function; more specifically, y=4.

yeah its a function as long as the x values don't repeat and gives different y values then its a function. also vertical line test in a graph. f(x)=4

it is function because for every input (x) there is one output(y)

Yes this is a function
function rule f(x)=4