The second I think is a clumping fescue. I had the same thing in many places in my yard. This weekend I just completed tearing it all out and planting new. The previous Sunday I sprayed every area with round up to make sure it killed the plant down to the root. Then this weekend I dug up all the grass about 4 inches down and tore it all out. I then filled with topsoil and good dirt and planted new seed and toped that with peat moss to keep it moist and the birds away. Hopefully the new grass comes in and makes it though the summer. I am in ND so our summers are not as hot as other places so I think it will make it. Note this will come back every year if you do not kill it and dig it out.

For our purposes there are two kinds of plants: grasses and broadleaf plants. Usually they are easy to distinguish from each other. Weed-b-Gon kills many varieties of broadleaf plants like dandelion, dichondra, spurge, dollar weed, and other plants with leaves. Grass has blades making them easy to distinguish from broadleaf plants. There is a product called Grass-b-Gon that would kill the weed, but since it is growing in grass, the GBG product will also kill the surrounding grass. RoundUp would work and so would GBG. You could either paint the weed with RU/GBG or you might be able to mask off the rest of the surrounding grass with cardboard leaving only the weed sticking out. Then spray the weed and remove the cardboard.

It's more like dallisgrass to me.