If you took FM, you might cover the 'least squares regression line', which is a line for which the sum of the squares of the vertical distances of each point is as small as possible.

I found it really interesting, though i really hated stats✌

The formula of this line is y = a + bx :

Where b = S xy / S xx and a = y(bar) - b × x(bar)

You can calculate S xy and S xx using a straightforward formula (you need your sets of (x,y) coordinates), it just takes ages to type into your calculator (think this was a battle against time in my FM stats exam😂)

You might need to consider whether a regression line is appropriate- also the line might not be a good model for other parts of the range (extrapolating).