9 Use the vertical line test to determine whether the follow

9. Use the vertical line test to determine whether the following graphs describe a func- tion. Explain yiour answer.

Solution

9) applying vertical line test on 1st graph ( parabola)

it passes vertical line test since drawing vertical lines on any part of the graph will cut the graph at just one point

hence, this is a function

ii) applying vertical line test on 2nd graph ( circle )

it does not passes vertical line test since drawing vertical line on any part of the circle will cut the circle at more than one point

hence, it is not a function