The graph below shows a function $y = f(x)\text{.}$ Moving the slider allows you to also graph $y = a\cdot f(x)\text{,}$ where you can change the value of $a$ between $-2$ and $3\text{.}$ Move the slider so $a = -2\text{,}$ and use what you observe to complete the statement below: The graph of $y = -2\cdot f(x)$ is like the graph of $y = f(x)\text{,}$ after it has been ? reflected over the x-axis reflected over the y-axis and ? vertically compressed by a factor of 1/2 vertically stretched by a factor of 2 .