Question

Which is a function

Answer 1

Answer:

Function, in mathematics, an expression, rule, or law that defines a relationship between one variable (the independent variable) and another variable (the dependent variable). Functions are ubiquitous in mathematics and are essential for formulating physical relationships in the sciences.

Step-by-step explanation:

Answer 2

Step-by-step explanation:

the second group. a function cannot have 2 of the same x values.

(7,9)

(20,14)

(9,-12)

(0,-9)