What is the slope of a line. its a straight line just below the x-axis (horizontol) and passes through -1 on the y-axis, is the slope -1, or undefined?

slope = 0

(not steep at all :)
the slope of any horizontal line is 0
y = m x + b
if m = 0, y = b forever for any x

K thanks! could you possibly answer my other question below the post of this one?

To determine the slope of a line, you can use the formula:

slope = (change in y) / (change in x)

In this case, you mentioned that the line is horizontal and passes through -1 on the y-axis, suggesting that it is a "horizontal line."

A horizontal line implies that the change in y is zero, as the line does not rise or fall. To calculate the slope, we divide the change in y by the change in x. However, in this scenario, because the line is horizontal, the change in y is zero.

So the slope is:

slope = 0 / (change in x)

Since the change in x can be any value, except zero since that would result in the line being vertical, the slope is considered to be "undefined," as division by zero is undefined in mathematics.

In summary, the slope of a horizontal line passing through -1 on the y-axis is undefined.