Functions and Linear Relationships

Is the relation a function? Why.

• Yes, because the x-value 11 has two y-values pair with it.

• Yes, because each x-value has only one y-value paired with it.

• No, because the x-value 11 has two y-values pair with it.

• No, because each x-value has only one y-value paired with it.

Which of these tables represent a function?

• A

• B

• C

• D

Is (1, 2) a solution to the linear equation 2x + 5y = 12?

• Yes

• No

Select all of the points that are solutions to the linear equation 5x + 8y = 40.

• (8, 0)

• (4, 2)

• (0,5)

• (1, 6)

Using the table above, determine which statement is correct.

• The table is proportional and the unit rate is 100.

• The table is not proportional because the unit rate is not constant.

• The table is not proportional because it doesn't pass through the origin.

• The table is proportional and the unit rate is 0.01.

Determine which equation does NOT represent a proportional relationship.

• y = -2x

• y = 1/2 x

• y = 3x

• y = 5x - 7

Using the table above, determine the equation of the line.

• y = 5x

• y = 10x

• y = 1/5 x

• y = 1/10 x

The table shows the weight in pounds of objects on earth compared to objects on the moon.  If an object on earth weighs 42 lbs, what is its weight on the moon?

• 7 lbs

• 12 lbs

• 84 lbs

• 252 lbs

What is the constant of proportionality based on the table above?

• 1/75

• 75

• 1

• 0

Sherry can buy 4 pounds of oranges for $18.  Write the equation to represent the cost, y, for x oranges.

• y = 4.5x

• y = 72x

• y = 2/9 x

• y = 4x