exam Maths Puzzle Numerical Ability

The following relation is not a function:

A. y = 3x + 7

B. x = y^2

C. y = x

D. x = y + 1

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exam Other Question

please help!

why do intersecting lines represent a unique solution? give examples to support your answer.
I was not sure what type of problem this would be so I put what i thought was close.

Which of the following relations represents a function?
a. (0,4) (0,-3) (1,-2)
b. (1,1) (1,2) (1,3)
c. (2,-1) (2,1) (2,3)
d. (-1,2) (1,2) (3,2)