The Lego Star Wars Equation

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Is there a way to calculate the number of pieces a lego star wars set has based on the price?

After putting several dozen sets through graphing software I wrote the linear equation "y = 0.12x + 1.5", where y represents the price and x represents the total piece count of the set.

The equation works fairly well but I have come to ask for advice on how to improve this. Any feedback is welcome. Also this is not an assignment I just have autism.