What is the map scale used to figure out?

The Map scale is used to figure out the length on how far apart the cities, states, and or countries from each other. If the scale is 1 : x, then divide the actual distance by x to calculate the map distance. If you were in Texas and wanted to figure out how many miles it was to Wyoming. See how many inches it is on a map, which is roughly like 3-4 inches.(Just a guess.)Then look on the bottom of the map and there is a scale. See what the scale says, it might say 3-4 inches is equal to about 1,000 miles.

That is what the scale does and how to use it. :) Hope this helped!

reflecting point a across the origin negates both of its coordinates.

b = (5, -4)