3. Which of the following equations represents a function?
a. y = 3x -6
b. 7x-5 = y2
c. 6x + y² = 12
d. y+ y = 44+5

4. Which of the following is an example of one-to-one relation?
a. {(1, 2), (1,3), (1,4),(1,5)}
b.{(2, 1), (3, s), ), (4,1), (5,5)}
c. (la, b), (c,d), (b, b), (c, b), (e, f)]
d. [(a, b), (c,d), (e, f, g, h), (1, 1))

5. In how many point(s) does a vertical line intersect the graph of a function?
a. at least one point
b. at exactly one point
c. more than one point
d. at exactly two points​