How to make line straight?

Hello there :3 I have a tiny problem in Blender - i don’t know how to make line selected on the image straight. I used to scale it 0 on one of the directions, but now it won’t work because it is at an angle. Can someone help me? :3
PS. Sorry for my bad English.

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You could just use the knife tool (K) or the connect tool (J) to cut a straight line between the two end points

Yeah, but I like to conect it later to the right edge seen on the image, so they will create together one straight line. Any solution to this?

Set transform orientation to normal, does that then allow you to do what you want ?

or to align your view to the face you could >

Select the face that has your edge.
Set Transform orientation to normal
Hit SHIFT+7 to align top view to your face
Then go to edge mode and select your edge
Then scale 0

Is that what you are wanting to do ?

Unfortunately, that isn’t what I want to do or it doesn’t work. I would like something like that on that image. I did it very simply - with knife tool, and I thought if there is some more… hmm… Professional and accurate solution to do this?
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