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

find the slope of the line through the points (6,4) and (-4, -1) Hi Can I have some help with a linear function is given?
g(x) = -7x + 8

(a) Find the average rate of change of the function between x = a and x = a + h.

(b) Find the slope of the line