exam Maths Puzzle Numerical Ability

x + 2y – z = 6
2x - y + 3 = 13
3x – 2y +3z = 16
Solve each system of equations algebraically using the method of substitution or the method of elimination. I

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exam Other Question
Perform the indicated operation


11-6/7-7 (This is a fraction.)

Would this one also be undefined?? find all roots of the polynomial x^3-x^2+16-16