Question

Which of the following does not represent a function?

Answer 1

Graph of a negative parabola oriented about the y axis with y intercept at positive 6 : It's a function

graph of an absolute value function oriented about the y axis : it's a function called piecewise 

graph of an ellipse with x intercepts negative 8 and positive 8 : it's not a function, since the vertical line intersects the ellipse in 2 different points

graph of a line with a positive slope and y intercept of negative 6: it's a linear function