m = (y1-y2)/(x1-x2)
y = mx + b
b = y2 - (x2y1 - x2y2)/(x1-x2)
y1 = New England summer leaves
y2 = New England Autumn leaves
x1 = taste of café au lait
x2 = taste of café mocha
m = ((New England summer leaves) - (New England Autumn leaves))/((taste
of café au lait) - (taste of café mocha))
b = (New England Autumn leaves) - ((taste of
café mocha)(New England summer leaves) - (taste of café
mocha)( New England Autumn leaves))/( taste of café au
lait - taste of café mocha)