Use the image to answer the question.
An illustration shows a coordinate plane with four quadrants. The x-axis ranges from negative 4 to 4 in increments of 1, and the y-axis ranges from negative 4 to 4 in increments of 1. A wavy line is graphed. The wavy line intersects grid lines at left parenthesis negative 2 comma negative 3 right parenthesis, left parenthesis negative 1 comma negative 1 right parenthesis, left parenthesis 0 comma 0 right parenthesis, left parenthesis 1 comma 1 right parenthesis, and left parenthesis 2 comma 3 right parenthesis.
Determine if the given graph represents a linear or nonlinear function. Enter 1 if the function is linear. Enter 2 if the function is nonlinear.