exam Maths Puzzle Numerical Ability

My puppy will not get on a scale. How do I determine his weight?

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exam Other Question

I dont understand how to start the problem or finish it either. I need help with these two matrice problems- solving it by the Gaussian elimination method:
problem 1.)2x + y - 3z =1
3x - y + 4z =6
x + 2y - z =9