The slope of the perpendicular is the negative reciprocal of the slope of a line. In this case, - (1 / -1) = 1.
An undefined slope is just a line straight down. The slope is undefined.
y = mx + bm is the slope, b is the y intercept
The "North Slope" refers to the region of the state of Alaska located on the northern slope of the Brooks Range (mountains), along the Arctic Ocean, the Chukchi Sea, and the Beaufort Sea.
it means steepness