A 4. Which of the following is an example of a nonlinear system of equations? O 5x + 6y = 13 6z- 12y = 14 O 6y = 13 +3z 6z - 12y = 14 O 5VE+ 6y = 13 6z 12y= 14 O 2x = 13 + 12y 6x + 12y 14

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