i really need help....i struggle with algebra...

14.50 = 0.75 x

x = 14.50 / 0.75

Isn't your equation

y = 3.75 + .75(x)

where 3.75 is the "fixed cost" part and .75(x) the "variable cost" part ???

If so, we have

14.50 = 3.75 + .75(x)

Subtracting 3.75 from both sides, we have

11.25 = .75(x)

Dividing both sides by .75, we have

x =

You have got two different answers because your question doesn't make sense!

Use the preview button and check that your queston is written correctly before you submit it.
If you are going to take the time to ask a question it might just as well make sense!