What is the distance between (4, 7) and (4, -5)?
Put these two points on a graph. Since they have the same x value, we don't even need to use the distance formula to find the distance: the distance is just a straight line.
So, how many units are between 7 and -5? Well just think of a number line, 5 units to go back to 0, and another 7 to get to 7, so a total of