- WE CAN USE THE VERTICAL LINE TEST TO TEST IF IT IS THE GRAPH ABOVE IS A FUNCTION OR NOT.
- IF THE VERTICAL LINE IS DRAWN ACROSS THE GRAPH AND IT TOUCHES THE GRAPH ONCE IT MEANS THE GRAPH IS A FUNCTION.
- IF IT TOUCHES THE GRAPH IT MEANS IT IS NOT A FUNCTION.
IN THE ATTACHED PICTURE YOU CAN SEE THE YELLOW VERTICAL LINE TOUCHED THE GRAPH ONCE IT MEANS THE GRAPH ABOVE IS A FUNCTION.
THEREFORE THE LAST OPTION IS THE SOLUTION. THE GRAPH IS A FUNCTION BECAUSE IT PASSES THE VERTICAL LINE TEST .
HOPE THIS HELPS