Awater from a little lake drained a total of 3.5 liters in 4 days
what is the average change in water volume each day? ?
*show me how you got your answers*

So, in 4 days, the lake lost 3.5 liters, and you need to solve for how many were lost each day. 
There are two ways to do this; one involves writing an equation, the other does not. It pretty much just depends what your teacher expects from you.

The easiest way is to simply divide 3.5 by 4; this will tell you how many liters were lost each of those four days.

The other way does the same thing, but a little more algebraically...
3.5 liters per day were lost- this can be written as a ratio: 3.5 liters/ 4 days.
You need to solve for x liters/ 1 day.
Since these are equivalent, you set them equal to each other: 

From here, you can cross multiply to get 3.5=4x
Then simply divide both sides by 4 (to isolate the variable) and you get 1.5=x.
Since the variable x represented the number of liters lost in 1 day, you can write your answer as 1.5 liters. 

So, the simple answer is: the average change in the water volume each day was 1.5 liters. 

Where the white dots are is where your points should be plotted.a translation is simply just moving something from one place to another. in this case, you would move each plot point of the original shape 2 units up, and 5 units to the left.