A straight line equation
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It is a line that passes through or nearly passes through the plotted points on the coordinated grid.
line of best fit
Oh, honey, let me break it down for you. A trend line is a general direction showing the overall trend of data points, while a line of best fit is a specific line that minimizes the distance between the line and the data points. So basically, a trend line is like a rough sketch, and a line of best fit is like the tailor-made suit that hugs those data points just right.
It is called the line of best fit because it tends to satisfy all the possible points in consideration at the same time with minimal variation.
By finding the line of best fit and using the straight line equation formula.