Solve the following 3 equations simultaneously
2x + 3y + z = 21
2x - 3y + 2z = -8
2x + y - z = 11
From 1
2x = 21 - 3y - z ---------------4
Put this in 2
21 - 3y -z - 3y +2z = -8
-6y - 3z = -33
2y + z = 11
z = 11 -2y --------------5
Put 5 in 4
2x = 21 - 3y - 11+2y
2x = 10 -y----------------6
Put 5 & 6 in 3
10-y +y - 11 + 2y = 11
2y = 12
y = 6
Put this in 5 & 6
x = 5 - y/2 = 2
z = 11-2y = 11 - 12 = -1
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