Graph transformations

• What does y=2f(x) do to a function?

  stretches function vertically by factor of 2
• What does y=f(1/2x) do to a function?

  stretched function horizontally by factor of 2
• What does y=-f(x) do to a function?

  reflection in the x axis
• What does y=f(-x) do to a function?

  reflection in y axis