exam Maths Puzzle Numerical Ability

Could you please help me solve this system of equations?

5x+3y+z=-13
x-3y+2z=1
14x-2y+3z=-16

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exam Other Question

The body mass index I can be used to determine an individual's risk from heart disease. An index is given by the formula, or model, I=H to the second power/700w, where W=weight, in Multiply: [ (1/2)x+(1/3)] [(1/2)x-(1/4)]