Math 8 Chapter 4: Functions

Look at the graph. Is the relation a function?

• yes

• no

What is the definition of function?

• Has inputs and outputs

• Every input has only ONE output

• Inputs have different outputs every time

• x-values and y-values

Tags

CCSS.8.F.A.1

CCSS.HSF.IF.A.1

For the function {(0,1), (1,-3), (2,-4), (-4,1)}, write the domain and range.

• D: {1, -3, -4,}
  R: {0, 1, 2, -4}

• D:{0, 1, 2, -4}
  R:{1, -3, -4}

• D:{0, 1, 2, 3, 4}
  R:{1, -3, -4}

All of the y values or outputs are called what?

• Domain

• Range

• Relation

• Function

Tags

CCSS.8.F.A.1

CCSS.HSF.IF.A.1

• Function
• Not a Function

Is this relation a function?

• Yes

• No

• Sometimes

Tags

CCSS.8.F.A.1

Find the y-intercept of

y = -2x + 8.

• (8,0)

• (0,8)

• (-8,0)

• (0,-8)

Is this relation a function?

• Yes

• No

• Sometimes

If f(x) = 3x-9, find the value for f(-8).

• -24

• 15

• -15

• -33

Tags

CCSS.HSF.IF.A.2

Find the x-intercept of

y = -2x + 8.

• (4,0)

• (0,4)

• (-4,0)

• (0,-4)