exam Maths Puzzle Numerical Ability

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

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exam Other Question

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
solve by graphing
2x-y=4
2x-y=6