exam Maths Puzzle Numerical Ability

5x + 4y - z = 1
2x - 2y + z = 1
-x - y + z = 2

solve each system using substitution

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exam Other Question

(3x^2+4x-7)/(x-2) Factor completely:
x^2 - 7x - 8

My answer: prime (no common factors)

I am not sure this is correct, I am just now learning the factoring process, could someone please check my answer and possibly help?

Milliron