added review11 to chapter13

Author: trapperdot00

Chapter13/README.md

@@ -98,3 +98,6 @@ What do we mean when we say that a series approximates a function?
 
 ## [Review 10](review/10.txt)
 Why would you sketch out the layout of a graph before writing the code to draw it?
+
+## [Review 11](review/11.txt)
+How would you scale your graph so that the input will fit?

Chapter13/review/11.txt

@@ -0,0 +1,5 @@
+For two-dimensional graphs, we need to scale the x and y axes to make our inputs fit.
+We can get a scaling factor by dividing the size of the given axis
+with the range of the corresponding dataset.
+Then we can align the input data to a coordinate by subtracting the minimal value from it,
+multiplying that with the scale, and adding it to the given axis' starting coordinate.