The equation
is a function
Explanation:
Given that the graph contains the coordinates
,
,
and 
We need to determine whether the equation
is a function.
To determine the equation is a function, let us substitute the coordinates in the equation and check whether it satisfies the equation.
Let us substitute the coordinate
in the equation 
Thus, we have,



Thus, the coordinate
satisfies the equation 
Substituting the coordinate
in the equation, we have,


Thus, the coordinate
satisfies the equation 
Substituting the coordinate
in the equation 


Thus, the coordinate
satisfies the equation 
Substituting the coordinate
in the equation, we get,


Thus, the coordinate
satisfies the equation 
Hence, the coordinates
,
,
and
satisfies the equation 
Thus, the equation
is a function.