Finding least squares solution of Ax=b?

[Math100]

TL;DR

Does anyone know the command or how to find the least squares solution of Ax=b on Ti-89 graphing calculator?

Does anyone know the command or how to find the least squares solution of Ax=b on Ti-89 graphing calculator? I'm trying to check my answers on Ti-89 for those linear algebra problems.

 

[noa]

I have a ti-84 and i am not with it right now so don't quote me on this lol but did you enter your x values into L1 and your y values into L2? on my Ti84 after that, you go to stat --> calc --> 8 (which is LinReg(a+bx)) and press enter.