Problem
which of the following is a function?
a. (2, 5),(5,2),(0,0)
b.(2,5),-9,0)
c.(-9,2)(0,-9)
d.(2,5),(5,-9),(2,0)
Solution
For this case we need to satisfy that for each value we have just one value of y and if we analyze one by one the options we have:
a. (2, 5),(5,2),(0,0)
For this case is a function we satisfy the definition
b.(2,5),(-9,0)
This is a function based on the definition
c.(-9,2)(0,-9)
This is a function satisfy the condition
d.(2,5),(5,-9),(2,0)
This is not a function since for x=2 we have two values of y