Answer:
4) {(0,1), (1,0), (2,0), (3,2)}
Step-by-step explanation:
One-to-one functions are when there is only one x value for a specific y value.
In function 4) the points (1,0) and (2,0) break the rule.
The y-value 0 has both x values 1 and 2.
Answer:b and d
