exam Maths Puzzle Numerical Ability

Use an augmented matrix to solve the linear system.
x+4y-2z=3 Step #1 [1 4 -2: 3]
x+3y+7z=1 [1 3 7 :1]
2x+9y+z=8 [2 9 1 :8]

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exam Other Question

logn1/8=-3

n=log81/6

log1/8n=4/3

log2n=-3

log1/9^27=n
identify the base in the statment 10%of 400 is 40