exam Maths Puzzle Numerical Ability

5x-2y+3z=-9
4x+3y+5z=4
2x+4y-2z=14

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exam Other Question

Dear Tutor
How can you assess the value of using matrices as an alternate method of organizing and analyzing complex data sets.
Thanks a lot
Reply ASAP please
Charlie Simplify by combining like terms:

Xsqrt18 - 3sqrt8x^2

I can not really see any like terms in this process, is there like terms?