Question: In Exercises 1-6, determine which equations are linear equations in the variables x, y, and z. If any equation is not linear, explain why not.

In Exercises 1-6, determine which equations are linear equations in the variables x, y, and z. If any equation is not linear, explain why not.
1. x - πy + 3√5z = 0
2. x2 + y2 + z2 = 1
3. x-1 + 7y + z = sin (π/9)

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