Question

Each unit on a coordinate plane represents one mile. One end of a road starts at (-12, -3). The road ends at (6, -3). How long is the road?

Answer 1

The distance from x=-12 to x=6 on the horizontal line y=-3 is
.. 6 -(-12) = 18 units

Since each unit represents 1 mile, the road is 18 miles long.