exam Maths Puzzle Numerical Ability

Solve for X, Y, and Z in the equation

a. X + 2Y + Z = 6

X + Y = 4

3X + Y + Z = 8

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exam Other Question

I dont understand how to set up and write a proof like when it tells me whats given and what i have to prove i dont know how to prove it use calculator to find real zeros of. f(x)= x^3 + 6x^2-10