Match each graph with its equation.

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  1. y=2x\displaystyle {y}={2}^{{-{x}}}
  2. y=2x\displaystyle {y}=-{2}^{{-{x}}}
  3. y=2x\displaystyle {y}=-{2}^{{x}}
  4. y=2x\displaystyle {y}={2}^{{x}}