1.
Points (-5, 8) and (-5, -4) are on the same vertical line. This is because both points have the same x-coordinate (-5). If one were to draw a line between these two points, then the line would be vertical.
2.
Skye travels 27 units. Since points (11, 15) and (11, -12) are on the same vertical line but in different quadrants, all one has to do is add the absolute value of the numbers to find the distance between them. One knows that these numbers are on the same line because they have the same x-coordinate. These points are in different quadrants because the y-coordinate values (in the sense of negative or positive) are different. Therefore, to find the distance traveled, one must do;
|15| + |-12|
Since the absolute value is the distance from zero, one can say that the expression equals,
15 + 12
= 27