exam Maths Puzzle Numerical Ability

Could you please take the time to help me solve this problem: Using the Row Echelon method, solve the following system of three linear equations: x + y + 2 z = 1 and 2 x + y = 2 an

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exam Other Question

1)What is the inverse element of 7 under the binary operation "X" defined on the set of real numbers.
2)The binary operation * is defined on the set {0,1,2,3} as a^2-b^2+ab. Find (x - 2/3)^2 = 14

help to solve would be appreciated

thank you