book Maths Puzzle Numerical Ability

It has been many years since I have had algebra. Please point me in the right direction with this system of linear equation...

x + 2y - 7z = -1
3x + 7y - 24z = 6
x + 4y - 12z = 26

Thank you from Montgomery, AL

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Hello,


I would appreciate it if a tutor could verify my answer for the below problem.


Solve the inequality x^2-10 less than or equal to -3x using the test point method. 6x + y = 12