The equation of a line is "y = mx + b." If we call "b" the y variable and "a" the x variable, we have that the form for a line is
<-- I needed to change the "b" for the y-intercept.
So try this:
Picking the first two in the set gives:
Pick any point on the (alleged) line:
You can verify that the equation b = -3a + 80 gives the relationship between a and b.
Obviously this will only work if there is, in fact, a linear relationship between the two data sets...