Question

Slope of (1,-9)(-1,-9)

Answer 1

`\large\textrm{zero}`

Further explanation

We can use the slope formula to find the slope, but there's a shortcut.

If we look at the points more closely, we'll see that their y co-ordinates are the same.

That means we have a horizontal line.

`_ < \!\!\rule{350}{1}\!\!_ >`

The slope of horizontal lines is always zero.

As for vertical lines, their slope's not defined, and their x co-ordinates are the same.

In conclusion, the slope of the line that goes through (1, -9) and (-1, -9) is zero.

Answer 2

m = 0

Explanation:

Slope = rise/run or (y2 - y1) / (x2 - x1)

Points (1,-9) (-1,-9)

We see the y stay the same and the x decrease by -2, so the slope is

m = 0 / -2 = 0