Unit 7 Review

What is the definition of a function?

• Has inputs and outputs

• Inputs have different outputs every time

• Every input has exactly one output

• There are x-values and y-values

Is the relation a function?

• Yes

• No

Is the relation a function?

• Yes

• No

Is the relation a function?

• Yes

• No

List the ordered pairs from the mapping diagram. Then, determine whether the relation is a function.

• (0, 0), (1, 2), (1, 4), (2, 6) ; Yes, this is a function.

• (0, 0), (1, 2), (1, 4), (2, 6) ; No, this is not a function.

• (0, 0), (2, 1), (4, 1), (6, 2); Yes, this is a function.

• (0, 0), (2, 1), (4, 1), (6, 2); No, this is not a function.

Write a function rule for the statement:

The output is three less than the input

• $y=x+3$

• $y=x-3$

• $y=3-x$

• $x=y-3$

Write a function rule for the statement:

The output is 4 more than triple the input.

• $y=3x+4$

• $y=3+4x$

• $y=4-3x$

• $y-x=4+3x$

Find the value of y for the given value of x.

• 13

• 3

• 39

Find the value of y for the given value of x.

• 3

• 7

• -1

• -3

Find the value of x for the given value of y.

• -4

• 4

• -250

• 250