Use a graphing utility and the change-of-base property to graph the function. y = log : (x - 1) Since calculators use common logarithms (base 10) and natural logarithms (base e), log (x - 1) cannot be entered directly into a calculator. To write a logarithm in terms of quantities that can be evaluated by a calculator, use one of the change-of-base properties shown below, where b is any logarithmic base and M is a positive number. log M In M log - M= log b log - M= In b Write log : (x - 1) using common logarithms or natural logarithms. y = log 6(x - 1) y = 0