How do you make value key frames linear?

So I’m throwing together a quick animation in the compositor that is basically a video clip with an image overlayed on top. I’m using the transform and rotate nodes to animate the image. The only problem is that its is not a linear transformation or rotation its bezier. So at first I thought I could just open up the graph editor and change it there but but the animations do not appear there from the compositor or when changing values with key frames. So how can I get a smooth transition instead of starting slow speeding up and then ending slow?

Ensure you have selected the node so its animation channels show up in the graph editor