Yes it has 2 sets of parallel lines.
For the equation, the rate of change would be four.
Now looking at the graph, look at each point of the line that hits perfectly on a grid. Count up four, over two. The rate of change for the graph would be 4/2, or 2. Hope this helps!
To solve this problem you must apply the proccedure shown below:
1. You have the following parent function given in the problem above: 
2. If you want to shift this parent function up six units, you only have the add a
, then, you will obtain the following new function:

Therefore, as you can see, the answer is: 
Answer:
Step-by-step explanation:
Monke