exam Maths Puzzle Numerical Ability

How to figure row of operations on augmented matrix to determine whether the system is independent, dependent, or inconsistent.

x+y+z=11
x-y=3z=15
2x=2y+2z=15

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exam Other Question

log base 2 (x+5) + log base 2 (x+2) = log base 2 Hi I asked this question before but forgot something How do you figure out the area of an triangle with all sides equal and the only number given is 5 thanks