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

A painter works on a job for 10 days and is then joined by her helper. Together they finish the job in 6 more days. Her helper could have done the job alone in 30 days. How long would it have taken the painter to do the job alone? For the polynomial function y= f(x) the graph of x^3 -2.5x^2 - 1.4375x + 2.0625 for which values k = 0, 1, 2, or 3 will the equation f(x) = k have complex roots?