Unit 6: Functions and Proportionality

How can you determine if a relation is a function? (Select ALL that apply.)

• Make sure the y's don't repeat

• Check that for every output, there is exactly one input. (x's don't repeat)

• Use the VLT to see how many times the line and graph intersect.

• None of these answers are correct.

Tags

CCSS.8.F.A.1

The value of y varies directly with x. If x = 7, and y = 21, then find the value of x when y = 60.

• 20

• 180

• 3

• 14

Tags

CCSS.7.RP.A.2B

Given the function f(x) = 7(3 -x) + 5, which of the following is a TRUE statement?

• f(9) = - 42

• f(-3) = 5

• f(-4) = 54

• f(3) = 0

Tags

CCSS.HSF.IF.A.2

Write only the output value. NOT g(-7) =.

Example: -12

Tags

CCSS.HSF.IF.A.2

Summer and Mia created graphs. Whose graph represents a function?

• Summer's only

• Mia's only

• Both of the graphs are functions

• Neither of the graphs are functions

Tags

CCSS.HSF.IF.A.1

CCSS.HSF.IF.B.5

Which of the following represents a function?

• {(2, 4), (3, 6), (-2, 4), -3, 6)}

• 
• 
• 

Tags

CCSS.8.F.A.1

Which coordinate point makes this graph not a function?

• (4, 2)

• (2, 0)

• (-3, 1)

• (0, -1)

Tags

CCSS.HSF.IF.A.1

CCSS.HSF.IF.B.4

CCSS.HSF.IF.B.5

What is the linear equation for Direct Variation?

Tags

CCSS.HSA.CED.A.1

CCSS.HSF.BF.A.1

CCSS.HSF.LE.A.2

If y varies directly with x, and x = 4 when y = 32, what is the constant of proportionality, k?

• k = 1/8

• k = 8

• k = 36

• k = 28

Tags

CCSS.7.RP.A.2B

It takes 4 painters to paint 3 walls. How many painters will it take to paint 9 walls?

Tags

CCSS.6.RP.A.3B