I have this question as part of my Pre-Calc summer work. I never learned about f(x) equations without the variable x in them... it just doesn't make sense to me based on what I know. Please help! I need to turn this thing in today if possible..

Let's just think of f(x) as another way to refer to y

f(x) = y

f(-2) = 1, is telling you that when x = -2, y = 1

f(-1) = 3, is telling you that when x = -1, y = 3

So they're giving you 2 points and asking you to find the equation of the line.

(-2, 1) (-1, 3)

To go from here, you can find the slope (change in y over change in x) and then write out the equation using point-slope form. Lastly, rearrange into slope intercept form and you're all set.

Check out this site of an example and step by step directions:

http://www.mathsisfun.com/algebra/line-equation-2points.html