Barry Kissane
3 X 3 EQ
Purpose
Solving a set of three simultaneous linear equations, by entering only the coefficients of each.
Operation
The program reminds you of the form for the equations:
a11x + a12y + a13z = b1 a21x + a22y + a23z = b2 a31x + a32y + a33z = b3
You may have to rewrite your equations into this form before entering them. Input the twelve coefficients in the correct order, pressing 
after each.
If the coefficients are all integers, the result will be given as a fraction.
Test the program by finding the solutions to the system:
2x + 3y + z = 3 12y – 2x + 2z = 7 x – z + 4y = 11
The solution is x = 21/160, y = 1/160 and z = 87/32.
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