The second step is to keep your x terms on the left and move the constant to the right by subtracting it from both sides.
Answer:
<h3>(-3,1) U (3,8) is the right answer.</h3>
See attached picture for answers:
So we know that the slope-intercept form of an equation is:

And we are given the equation: 
So we need to subtract 2x from both sides:

And then divide both sides by 3:

The answer is C. You would use MEAN because it gives you the average although it doesn't always have to be a whole number. Therefore despite that one student performing badly won't affect the rest of the class.
Again hope this helps : )