Question

Use a table to stretch the function y= f (x) vertically by a factor of 2. Identify the graph of the function and its transformation.

Answer 1

The rule of the transformation to stretch the function y= f (x) vertically by a factor of 2 is given by

(x,y) --------> (x,2y)

that means

In the function f(x) the point (2,1) ----------> after the transformation is the point (2,2)

therefore

the solution is the graph below