Answer:
If x = 0,
0 + y = 3
y = 3
If x = 1,
1 + y = 3
y = 2
If x = 2,
2 + y = 3
y = 1
If x = 3,
3 + y = 3
y = 0
∴ R = {(0, 3), (1, 2), (2, 1), (3, 0)}
Hence, R is a function.
Answer:
If x = 0,
0 + y = 3
y = 3
If x = 1,
1 + y = 3
y = 2
If x = 2,
2 + y = 3
y = 1
If x = 3,
3 + y = 3
y = 0
∴ R = {(0, 3), (1, 2), (2, 1), (3, 0)}
Hence, R is a function.