Answer:
-69. Nice!
Step-by-step explanation:
The slope of a line between two points is defined as the ration between the vertical distance and the horizontal distance - note that it doesn't matter if you go from the first to the second point, or the opposite, signs will end up fixed anyways. Let's get calculating!
[tex]\Delta y = -12 -57 = -69 \\ \Delta x = 99 - 98 = 1[/tex]
Your slope is [tex]m = {\Delta y \over \Delta x}={-69 \over 1 } = -69[/tex]
