This looks to be a variety of Crabgrass. If so, then yes, it can be eliminated. Not sure what type of grass you have, it doesn't look like anything that we have in southeast Alabama. But you can go here and see the recommendations for herbicide based on your grass type.

I was told it is quackgrass and only roundup can kill it along with the rest of my lawn

If those photos ( posted 3rd week May 2020) were taken spring 2020 in NW NJ, the grassy weed pictured is not crabgrass.

It doesn't look like crabgrass? More like quackgrass or a broadleaf fescue (K-31 style!) stuck in the midst of a finer grass.

Without a real closeup and a complete leaf tip, it's always a little hard to tell.

I had to do some research. Certainty will control quackgrass, but it's a little harsh (it's also a not-too-bad selective herbicide for the lesser fescues, so it would also knock back K-31, believe it or not, although it's not listed on the label).

Tenacity does not have quackgrass listed on the label, so it would be irresponsible of me to tell you that it has an effect on quackgrass, but that you would theoretically have to work at it a little bit and time it properly so that the quackgrass were stressed just before winter so that carb storage were low, and probably again throughout spring so it can't recover as summer approaches.

Amusingly pursuant to a screeching whine in another thread this evening, it's easy to cough up tons of references stating specifically that Tenacity doesn't work on quackgrass. That's only technically true, in this case, the worst kind of true. It would be an off-label use.

Tenacity would have little to no impact on K-31, which is going to shrug and go on living its best life until dosages increase to the point where your main grass is also taking damage.