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It is a perpendicular line that intercepts another line at 90 degrees.
If you place the numbers on the number line, they go from the least to the greatest as you go from left to right.
You have to rearange the numbers in order, (either from least to greatest or greatest to least) then you have to subtract them from the larger number to the smallest number, and that is your range.  You're welcome!
There are several ways to write an equation for a line. One common form is y = ax + b, where a is the slope and b is the y-intercept (where the line intercepts the y-axis).