Functions or Not a Function and Direct Variation

Is this set of ordered pairs a function or not a function? 

• Function

• Not a Function 

• Function
• Not a Function

Function or not a function?

• Function

• Not a Function

y varies directly with x. If y = 12 when x = 2 AND y = 30 when x = 5, what is the constant of variation ( y = kx )?

• k = 12

• k = 4

• k = 6

• k = 2

The number of kilograms of water in a person’s body varies directly as the person’s mass.  A person with a mass of 90 kg contains 60 kg of water.  How many kilograms of water are in a person whose mass is 75 kg?

• 50 kg water

• 72 kg water

• 94 kg water

• 150 kg water

Function or NOT a function?

• Function

• Not a Function

Is the graph pictured a function?

• Yes

• No

Function or NOT a function?

• Function

• Not a Function

Is this set of ordered pairs a function or not a function? 

• Function

• Not a Function 

Is this graph a function or not a function? 

• Function

• Not a Function