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

The length of a rectangle is 4 times the width. What are the dimensions if the perimeter is 80? Find values for m and b in the following system so that the solution to the system is (-3, 4)

5x+7y=b

mx+y=22

Thanks for any help you can give

Heather