book Maths Puzzle Numerical Ability

Do the augmented matrix

x-2x4 =-3
2x2+2x3=0
x3+3x4=1
-2x+3x2+2x3+x4=5
Determine if this system is consistent

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book Other Question

Solve and show steps to answer

7/y - 1/3 = 1/4
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