# How do you determine the amplitude, period, and shifts to graph #y = - cos (2x - pi) + 1#?

##### 1 Answer

The amplitude is -1, the period is

#### Explanation:

The general pattern for a cosine function would be

To find the period of the graph, we must find the value of b first. In this case, we have to factor out the 2, in order to isolate

The equation now looks like this:

We can now clearly see that the value of b is 2.

To find the period, we divide

Next, the