exam Maths Puzzle Numerical Ability

Solve

x + y + z = 11
2x + y - z = 13
x = 2y

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exam Other Question

63.4/c to the -3 power
64.ab to the -8 power/c to the 5th power Solve the system of equations using the addition elimination method. If the answer is a unique solution present it as an ordered pair (x,y) if not specify whether the answer is no solution or infinitely many solutions

3x - 11y =9
-9x + 33y = 18