Determine which of the graph below represent a function 1 2

Determine which of the graph below represent a function: 1 2 1&3 2&3

Solution

a curve is defined as a function when at one value of x there is only one single output then this curve is called function.

In other words we can say that when we draw a line perpendicular to x-axis and if it cuts the curve at only one single point then it is a function.

so,

(1) it is not a function as perpendicular line to x-axis cuts curve at 2 points.

(2) it is a funtion.

(3)it is also a function.