exam Maths Puzzle Numerical Ability

I need to solve this system of 4 equations using Guassian Elimination and have only solved 3 equation systems using GE. Can you show me the steps for the 4 equations? x + y + 2z

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exam Other Question

I have a quesiton on how to fine the domain of a compostite funtion f*g

f(x) =x+6, g(x) =4/x+8

i think it is x is not equal to -14 Find three consecutive even integers so that 7 times the third is equal to 20 less than the first.