# What is the amplitude of #y=-2/3sinx# and how does the graph relate to #y=sinx#?

##### 1 Answer

Feb 11, 2018

See below.

#### Explanation:

We can express this in the form:

Where:

#color(white)(88)bba# is the amplitude.#color(white)(88)bb((2pi)/b)# is the period.#color(white)(8)bb(-c/b)# is the phase shift.#color(white)(888)bb(d)# is the vertical shift.

From our example:

We can see the amplitude is

So:

Graphs of the different stages: