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[Joe Horn]

You can use the RREF function to solve ANY size system of linear equations. Example (stolen from a random website):

Solve this 4×4 system:

4w+ x+2y-3z=-16
-3w+3x- y+4z= 20
-w+2x+5y+ z= -4
5w+4x+3y- z=-10

Just do this on your Prime:



Notice that the input matrix is simply the original problem with the variables and equal signs omitted (this is sometimes called an "augmented matrix" in the textbooks). (Always be sure that the variables are in the same order in each equation, and if any are missing, use 0 as their coefficient). The rightmost column of the output matrix is the answer you seek:

w = -1
x = 1
y = -2
z = 3

The mystical name of the magical RREF function means "Reduced-Row Echelon Form" which they used to teach us how to do by hand (what tedium!), but RREF does it all in one step for you.