Intimidating? Very…… but also very easy to solve! :D first get rid of the variables, literally forget about them so that it looks like 5 + 5 + 7 = 21 5 + 7 + 9 = 23 7 + 9 + 11 = 25 From here go to your calculator and press the 2 nd button and then hit x^-1. After you do this press the right arrow until you reach edit.
For the sake of understanding this we are going to pick to edit the letter A From here make it a 3 by 3 matrix and put in the values it should end up looking like this [5, 5, 7] [5, 7, 9] [7, 9, 11] After this we are going to hit the 2 nd button and the x^-1 button again (Remember hit 2 nd first before hitting x^-1 otherwise you will mess everything up). From here go to EDIT and pick B This time make it a 3 by 1 matrix and make it look like   
We are almost done now……. WEWTNESS!!!! :D from here simply hit 2 nd and go to x^-1 and instead of going to edit just press the number 1 and from here press x^-1 WITHOUT PRESSING THE 2 nd BUTTON LEAVE THAT ALONE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! After you have done that press enter and you should get [.5, -1,.5] [-1, -.75, 1.25] [.5, 1.25, -1.25] from here multiply this by the matrix B to get [-14.625] [-18.875] [24.5] And from here you have your answers to the variables x, y and z x= -14.625 y = -18.875 z= 24.5
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