Answer:
6
Step-by-step explanation:
There are two ways to do this. (You could also use the distance formula, but because the x coordinates are the same, these are the two easiest ways).
Method 1: counting.
Count the distance. This is shown in the picture attached. This is the easiest way to do it.
Method 2: solve.
the two coordinates of the points are (-3,3) and (-3,-3). Because the x value is the same, (x,y), you can subtract the y values: 3- (-3) = 6.