exam Maths Puzzle Numerical Ability

Could someone please help me solve this question: Using the Row Echelon method, solve the following system of three linear equations: x + y + 2 z = 1
and 2 x + y = 2 and x + 2 y +

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exam Other Question
Solve the system by using the addition method. -0.1x+0.05y=5 and 0.05x+0.06y=2.7 What is x? I am having trouble understanding if some quadratic equations can have one real and one imaginary solution? Is that possible?