Sketch the graph of each equation below.

1. $y = \sin\left(2πx\right)$ 

   Hint (a):

   This is the graph of $y = \sin x$ with a changed period.

   Answer (a):

   

2. $y = 3\sin\left(πx\right)$ 

   Answer (b):

   

3. $y = 2\sin\left(2πx\right) + 1$ 

   Answer (c):