Graph B displays a nonlinear function.
The reason for this classification is that a nonlinear function does not form a straight line when graphed. Since you mention that Graph B "curves up" into quadrant 1, this indicates that the relationship between the x and y variables is not constant; instead, the rate of change varies, which is characteristic of nonlinear functions. Linear functions, on the other hand, have a constant rate of change and will always graph as a straight line. The curvature observed in Graph B confirms that it does not adhere to the properties of linearity.
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