Can I play these games on this laptop?

Laptop: Lenovo ideapad 8gb ram, 1tb HDD, Intel Pentium n3540 quad core processor, shared graphics card ( I don't know what that is )
I would like to play:
Minecraft with no lag
Skyrim
Fallout 3
Fallout new Vegas
Also I was wondering if it could play new games like the witcher 3 even if I had to use low graphics.
Thanks and does the ram matter that much because I can get a 4gb model for cheaper.

No no you can't play those games at even 10 fps well maybe minecraft becuz those graphics suck but no your laptop its gonna play those at all more than 20fps

You are below a price point to even measure or predict gaming, except to say it is very low performance.
You need to state your country for shopping prices and options.
The large amount of ram and big HDD are not of much gaming help.
Pentium N3540 scores 1774
https://www.cpubenchmark.net/...u_list.php
The graphics is called Intel HD Bay Trail
AMD A8-6410 laptops can be bought in the USA at Best Buy or Newegg at US$280 to US$300
The cpu score is 2514
This is gaming to GPU
http://www.notebookcheck.net/...849.0.html
Bay trail at rank 512 is worse than Ivy Bridge at 473
and the R5 6410 is massively better than Ivy Bridge HD
http://www.game-debate.com/...ivy-bridge
But R5 6410 is 19% below Intel HD 4400 Mobility of core i3-4xxxU
http://www.game-debate.com/...400-mobile

The gaming of N3540 is too low to even try to estimate, and the cpu is weak even if better than most Celeron.
Not even close to new games.

The N3540 might guess play at lowest settings for Skyrim
http://www.game-debate.com/...quirements
Shared graphics means the video memory is taken from the 8GB of system memory.
They mean shared or allocated VRAM or gRAM (Video or Graphics ram).

It should play Minecraft at some setting set.

Just see if you can find one with a stronger graphics. It is too hard to guess at the lowest graphics in new laptops. A8-6410 or i3-4xxxU can be discussed about its gaming, even though these are standard budget laptop cpus. Given the 8gb/1tb, you can probably get a 4 or 6 gb/500gb with a better cpu/graphics at the same price.
In India mostly people look for lots of ram and CPU cores, even though the Graphics performance and actual CPU performance are #1 and #2 of importance.