exam Maths Puzzle Numerical Ability

2 1 1
5 4 1

2 1 1
3 3 _

I am suppose to find the missing number in the second matrix by using row operation.

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exam Other Question

Am I asking this correctly? The directions say: Use the substitution method to solve the linear system.

Problem:
1. y = x + 2
2x + y = 8
y+12when y=29