book Maths Puzzle Numerical Ability

Maria, Kai, and Dom sold tickets to the school dance. Kai sold 11 fewer tickets than 3 times the number Maria sold. Dom sold 10 more than both Maria and Kai put together. Together,

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Brenda and Trent are friends. Brenda is 24. The LCM of their age is 120 and the GCF of their age is 8. How old is Trent. Hi.
I need help on solving systems of equations using augmented matrix method. The systems are: x + y + z = -2, 2x - 3y + z = -11, -x + 2y - z = 8. Thank you very much for your ti