Which of the following equations are linear or nonlinear?

1. is y= – 1/2x -1.34 (linear or nonlinear)

2. is y= 2x^2 + 4 (linear or nonlinear

3. is y= 0.25x + 4 (linear or nonlinear)

4. is y= 2x (linear or nonlinear)

5. is y= 4x^3 (linear or nonlinear)

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Answer:Step-by-step explanation: