Question: x + y + z = 5 - a 2x + y = 7 - a x - y - 2z = 0 Use row

x + y + z = 5 - a

2x + y = 7 - a

x - y - 2z = 0

Use row operations to determine the values of x, y and z, in terms of a. For what values of a will x, y, z all be positive?

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