Functions Review

Solve

• 125

• 5

• 1/5

• 625

The graph shows that the price of bananas depends on the number of pounds purchased.  What is the unit rate for this data?

• $5 per pound

• $1.25 per pound

• $1.00 per pound

• $0.80 per pound

The graph shows the speed of 2 cars.  The speed of the blue car is 30 miles per hour.  Based on this graph, what is the best estimate of the speed of the red car?

• 20mph

• 30mph

• 45mph

• 60mph

What is the value of y in the following system of equations:
y=2x
y=4x-8

• 0

• 4

• 8

• 10

What is the solution of the following system?  (The intersection)

• (-0.5,8.5)

• (-0.5,0.5)

• (0,4)

• (2,-14)

The equation y=50x+30 represents the amount of money, y, in Amy’s savings account over time, x. The equation y=30x+50 represents the amount in Sally’s savings account. How does the graph of Sally’s account differ from the graph of Amy’s account?

• The graph representing Sally’s account starts lower on the y-axis.

• The graph representing Sally’s account starts closer to the origin.

• The graph representing Sally’s account is steeper.

• The graph representing Sally’s account is flatter.

The points (–3, –5), (0, 4), and (3, 13) lie on the same line. Which equation describes the function for that line?

• y=2x+1

• y = 3x + 4

• y = x + 4

• y = x + –2

What appears to be the solution to the system of equations shown in the graph below?

• (-4,-2)

• (-1,6)

• (-2,-6)

• (4,8)

Is the relation a function?

• Yes, each input has exactly one output

• Yes, each output has exactly one input

• No, each output has more than one input

• No, each input only shares an output

Use the table to write a linear function that relates y to x.

• y = x - 4

• y = -x + 4

• y = x + 4

• y = -x - 4