exam Maths Puzzle Numerical Ability

x + 2y = 0
4x -z = 4
5y + z = -1

solve each system using substitution

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exam Other Question

3x+y=4 Consider x-8/x+5 divided by x-9/x+4.Explain why -5,9 and -4 are not allowable replacements for the varialbe x.