Tanya is making homemade greeting cards the data table below represents the amount she spends in dollars f(x) in terms of the number of cards she makes x

The function that best represents the data is y = 0.75x + 4.5. The slope in this case represents the increase in the amount she spends in $ due to the number of cards she makes. The intercept with the Y axis (4.5) means that she has an expense of 4.5 $ without having made any card yet.