Which graph represents a linear function? A coordinate plane is shown with a curved line that starts in the bottom left area of the graph, passing through the point -1 comma -5, curving to pass through the y-axis at 2.5, then curving up again to pass through the point 1 comma 5 A coordinate plane is shown with a line passing through the x-axis at negative 2 and the y-axis at negative 6. A coordinate plane is shown with a parabola graphed in an upward U shape. The bottom of the parabola touches the y-axis at -10 and curves upward on both sides A coordinate plane is shown with a wavy line that sits on the x-axis and moves across the graph in even up and down waves.