Not necessarily. Often it is, but the line of best fit is simply an equation that closely matches the results. Therefore any line could be a line of best fit, linear, quadradic, or even cubic! The sky (and the results) are the limit.
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a line of best fit
The line of best fit does not have to pass through the 0 (origin) and rarely does
the dependent variable has one value and the independent variable has no value
The line of best fit is simply the line that shows the general direction of the graph. The trick is to make the line go through as many points on the graph as possible. Some scatter plots have no line of best fit.
How many of these 30° angles will fit together to make a straight line?