Question

1. which of the following can be used to identify a function?

a. vertical line test
b. elimination method
c. slope calculation
d. substitution method

Explanation:

The vertical line test is a graphical method to determine if a relation is a function: if any vertical line intersects the graph more than once, the relation is not a function. The elimination and substitution methods solve systems of equations, while slope calculation finds the steepness of a line, none of which identify functions.

Answer:

a. Vertical line test