Question 1178612
For both coordinates, x = -4, meaning it is a straight line that goes vertical. 

*[illustration Graph.png].

To solve this all you have to do is subtract both the y-coordinates. 


  7 - (-3)
= 7 + 3 
= 10 


Therefore, AB has a length of 10 units. 


I used Desmos to plot the points on a graph. This may be helpful for future problems like this.