Question

Plzz Help
Which statement about graph C and graph D is true?

Answer 1

Use the vertical line test for each graph. The vertical line test says that if you can draw a vertical line through a graph without the line touching the graph more than once, the graph defines a function. Try drawing a vertical line through the circle. Is there anywhere on the circle where a vertical line won't touch the graph twice? Now try vertical lines through the parabola. Is there anywhere on the parabola where a vertical line only passes through once? Answer these two questions then you can answer your question.