Practice Final Apex Unit 2 Functions (1st semester)

Which relation is a function?

• {(12, 2), (6, 4), (3,2), (6,5)}

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• {(8,5), (5,8), (8, 4), (5,4)}

Is this relation a function? Justify your answer.

• No, because two points with the same y-value have different x-values.

• Yes, because every x and y value is positive.

• Yes, because the number of x-values is the same as the number of y-values.

• Yes, because every x-value has a single y-value.

For a science assignment, Max records the height of a plant over time. The plant was 12 cm tall when he started the assignment. He notices that the plant grows 6 cm every week. Which point is on his graph?

• (1, 12)

• (36,4)

• (3,30)

• (24,2)

Characterize the slope of the line in the graph.

• undefined

• zero

• positive

• negative

What is the slope of the line through (-2,3) and (4,0)

• -1/2

• 1/2

• -2

• 2

What is the equations of the line through the origin and (-3, -7)

• y=7x

• y=3x

• $y=\frac{3}{7}x$

• $y=\frac{7}{3}x$

What is the equation of the line through (-2,6) and (0,2)

• y = x +2

• y = -x +2

• y = -x-2

• y = x -2

The relationship between the number of pounds (lb) of chicken and the price in dollars is shown in the graph. What is the unit price of chicken?

• $\frac{1dollar}{9\ lb}$

• $\frac{18dollars}{2\ lb}$

• $\frac{9dollars}{1\ lb}$

• $\frac{1\ lb}{9\ dollars}$

Three friends go grocery shopping together, and buys the same kind of strawberries. Joy buys 2 pounds (lb) for $3.00. Raul buys 4 pounds (lb) for $12.00. Jim buys 3 pounds (lb) for $9.00.

Identify the graph and unit price that represents the strawberry costs.

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Abbey and Alannah are learning to type on a computer keyboard.

Abbey's typing speed is represented by the equation y = 10x where y is the number of words she types and x is the number of minutes.

Alannah's typing speed is given by the graph.

Choose the statement that correctly compares their unit rates.

• Abbey's unit rate is equal to Alannah's unit rate.

• Abbey's unit rate is 1 more word per minute than Abbey's

• Abbey's unit rate is 2 more words per minute than Alannah's unit rate.

• Abbey's unit rate is 2 fewer words per minute than Alannah's unit rate.