exam Maths Puzzle Numerical Ability

I need helping to solve using row operations on each system:
x+yz-3z=1
2x-y+z=9
3x+y-4z=8

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exam Other Question

please help :)you have a model train car that is 10 in long and has a scale of 1 in to 5 ft. how long is the acual train? h=18t+1/2at^2

Solving for A