x decreases and y decrease

College Algebra
7th Edition
ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter1: Equations And Graphs
Section1.3: Lines
Problem 92E
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In the example problem below I don't see where x decreases and y decrease? 
Step 1

Example-

Suppose some insurance company provides the offer that what ever the amount you deposit the amount will become double in the next year.

This can be represented as linear equation as-

                                                         y = 2x           OR      f(x)=2x .

Step 2
   x       y
   1 2   = 2 * 1
   2 4   = 2 * 4
   3 6   = 2 * 3
  10 20  = 2 * 10

i.e.  it doubles the input.

   x       y
   20 40   = 2 * 20
   10 20   = 2 * 10

i.e.  when x decreases y also decreases.

 

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