Which shows the equation for the line of best fit for this data? Height (thousand ft) 2,3,4,5,6,7,8,9,10,11,12,13 Temperature F/deg 78,74,70,62,55,50,46,40,33,31,30,27

A) y=-5x

b) y=5x+87

c) y=-5x + 87

d) y=5x

That takes a bit of tedious calculation, but with the correct formula, anyone can find it:

Let our line of best fit have the form:

y=mx+b

m = (nΣxy-ΣxΣy) / (nΣx^2-ΣxΣx)

b = (Σy-mΣx) / n

Where of course Σ means the sum and n=number of elements in the data set.