Solving Simultaneous Equations Using the TI-89

Hello

The tutorial show how to do it:

https://www.electro-tech-online.com/custompdfs/2010/03/Simultaneous20Equation20Solver20on20TI-89.pdf

but I cant find this menu in my ti-89 and mine aint titanium edition. I do have the apps menu but its just not similar to the one shown.

Can anyone tell me how I can solve simultanous equations with two unknowns on my ti-89 none titanium?

Thanks in advance

You can solve simultaneous equations using the matrix function. See pg. 41 of this with a solution for three simultaneous equations shown on pg. 52.