Question

Look at this set of ordered pairs:

(10, 6)
(15, -9)
(18,8)
(19, 9)
Is this relation a function?
yes
no

Answer 1

The answer is yes because no value of x repeats remember a function is for every value of x is exactly one output for y so if you input the same value of x and you get two different values then it's not a function