exam Maths Puzzle Numerical Ability

Could you please help me solve this system of equations by using A^-1?

x+5y+5z=-7
x+4y+5z=-5
x+5y+4z=-5

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exam Other Question

I would greatly appreciate if someone could show me how to answer these problems. Thanks
-troubled student

*A boy can row a boat at a constant rate of 5 mi/hr in still water. what is the perimeter of a triangle where the sides measure 6,8,and 10 inches