1) Which of the following sets of ordered pairs define a function?
a. (3. 2), (-3. 6), (3.-2).(-3. -6)
c. 1(1, 2) (2.6). (3,-2). (4.-6)
b. (2. 2). (2.3). (2. 4), (2. -9)
d. (4.4). (-3. 4). (4. -4), (-3,-4)​