system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Red, Green and Blue make all the colors for TVs/monitors... Why not Red, Yellow and Blue?

We've all messed around with this function on a computer at some point, and I could never figure out why it was Green instead of Yellow. A simple color wheel would suggest this, right?
gpt
Monitors emit light, so they use *additive* colour mixing. Paints absorb light, so they use *subtractive* colour mixing. The primary colours of each process are directly opposed.  
You have red, green and blue in additive colour mixing because those are the peak wavelengths of the three kinds of cone cell in the typical human eye. You can mimic the mixture of cone cells activated by any visible wavelength by mixing different amounts of light at each of those peak wavelengths.  
Then you have the subtractive primaries that each remove one of the additive primaries from white light. Cyan subtracts red, magenta subtracts green and yellow subtracts blue.