Identifying and Evaluating Functions

How would you write y = 2x - 3 in function notation?

• y = 2x-3

• f = 2x - 3

• f(x) = 2x-3

How do you read f(x)?

• f x

• f of x

• f parenthesis x

• f with an x inside parenthesis

If f(x) = 2x + 1, what would be your first step to find f(1)?

• Plug a 1 in for all the x's

• Set the function equal to 1

• Only plug a 1 into the left side

• Only plug a 1 into the right side

f(x)=4x+5
f(4)=

• 21
• -11
• -31
• 25

f(x) is the same thing as ______.

• y
• x
• input
• an equation

For the function f(x) = -3x + 3 find f(0).

• 0
• -3
• 3
• -1

Tell whether the relationship is a function

• Function

• Not Function

Tell whether the relationship is a function

• Function

• Not Function

Tell whether the relationship is a function

• Function

• Not Function

Tell whether the relationship is a function

• Function

• Not Function