EDGE Math 8

1.	Which of the following statements is/are true?

All functions are relations.

All relations are functions.

both statements

neither of the two statements

Answer: All functions are relations.

2.	Which of the following equations does not define y as a function of x?

y = x^{2} + 5

y = 2 x - 9

x = y

x = y^{2} - 4

Answer: $x = y^{2} - 4$

3.	Which of the following relations is a function?

a teacher is paired with his/her students

a school bus is paired with its passengers

a newborn baby is paired with his/her mother

a barangay captain is paired with his/her constituents

Answer: a newborn baby is paired with his/her mother

4.	What can be said about the function $f (x) = 3 x^{2} + 7 ?$

It is an odd function.

It is an even function.

neither of the two statements

cannot be determined

Answer: It is an even function.

5.	The graph of an even function is symmetric with respect to which of the following?

x-axis

y-axis

origin

none of the options

Answer: y-axis