b is the intial value starting point
y is the dependent variable
m is the slope
x is the constant rate of change
derivative is the slope if the line is a curve
y ⇒ how far up or down is the line,
x ⇒ how far along is the line,
b ⇒ the value of y when x = 0 and
m ⇒ how steep the line is.
