Unit 3 Test Review

Jeffery started a coin collection. His dad gave him 80 coins. Each month he will add 25 coins to the collection.

Which equation can be used to find y, the total number of coins in Jeffery’s collection after x months?

• y = 80x + 25

• y = 25x + 80

• y = 80x – 25

• y = 25x – 80

Which equation best represents the relationship between x and y in the graph?

• $y=\frac{1}{4}x\ –\ 4$

• $y\ =\ 4x\ -\ 4$

• $y\ =\ \frac{1}{4}x\ +\ 1$

• $y\ =\ 4x\ +\ 1$

What is the solution to this equation? 18.12 – 5x = 72.22

• -6

• -10.82

• 18.07

• -10

Which equation best describes the relationship between x and y in the table below?

• $y\ =\ 3x\ +\ 5$

• $y\ =\ \frac{1}{5}x\ +\ 3$

• $y\ =\ \frac{1}{3}x\ +\ 5$

• $y\ =\ x\ +\ 3$

The length of one normal pencil is 1 ¼ inches long. What is the length in inches of 12 of these pencils?

Which table contains only values that satisfy the equation y = 0.5x + 14?

• A

• B

• C

• D

A fish is swimming at a constant rate toward the ocean floor. The equation y = -9x – 15 can be used to represent this situation, where y is the depth of the fish in meters below sea level and x is the number of seconds the fish has been swimming.

Which statement best describes the depth of the fish, given this equation?

• From a starting position of 9 meters below sea level, the fish is descending 15 meters per second.

• From a starting position of 9 meters below sea level, the fish is ascending 15 meters per second.

• From a starting position of 15 meters below sea level, the fish is descending 9 meters per second.

• From a starting position of 15 meters below sea level, the fish is ascending 9 meters per second.

Which equation best represents the table?

• a = 200m

• a = 1000 - 100m

• a = 1000 - 200m

• a = 1000 + 100m

Which equation best represents the relationship between x and y in the graph?

• $y=\ 6x\ -\ 3$

• $y\ =\ \frac{1}{2}x\ -\ 3$

• $y\ =\ -3x\ +\ 6$

• $y\ =\ \frac{1}{2}x\ +\ 6$

Aaron needs to uber from the airport back to his house. The uber driver charges a $2.25 initial charge plus $3.50 per mile. Which equation can be used to find y, the total cost of the trip, if x represents the number of miles on the trip?

• y = 2.25x + 3.50

• y = 3.50(x + 2.25)

• y = 3.50x – 2.25

• y = 3.50x + 2.25