Step-by-step explanation:
For the first question, look at the y values. They are 3 and 12. To find the length between those values, subtract and you'll get 9 units.
For the second question, you would subtract the x-coordinates.
* For both of these questions, make sure you know your x and y axes. The y-axis is always vertical and the x-axis is always horizontal.
Answers:
1. 9 units
2. subtract the x-coordinates