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Let \((u_n)\) be the sequence defined by \(u_0 = 6\) and for all \(n \in \mathbb{N}\), \(u_{n+1} = -0.5u_n + 2\).
  1. Plot the function \(f\) defined by \(f(x) = -0.5x + 2\) and the line \(y = x\).
  2. Graphically represent the first four terms of the sequence on the \(x\)-axis.
  3. Conjecture the variations and the limit of the sequence \((u_n)\).

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