Linear Interpretation

The graph below shows the relationship between the distance in miles a delivery truck traveled and the number of hours each delivery took. Which of the two given points would be the best to use to calculate the line of best fit?

• (500, 11) and (700, 11)

• (300, 9) and (400, 7)

• (400, 9) and (500, 11)

• (300, 7) and (600, 10)

What type of correlation is shown in this plot?

• Positive

• Negative

• No Correlation

Chang wants to know if he is improving his skill on the cello. He created a scatter plot and drew a line of best fit. If he uses the point (2, 8) and (5, 1.5) from his line, which equation would best represent the line of best fit?

• y = -2.17x + 12.3

• y = 2.17x + 3.77

• y = -0.46x + 9

• y = -2.17x – 9.35

• Accelerating gradually

• Stopping

• Slowing down constantly

• Speeding up constantly

A frozen yogurt store charges based on how many ounces of yogurt, y, a customer puts in their cup. They also charge a flat price for unlimited toppings. The function for the cost of a cup of yogurt with toppings is f(y)=0.37y+1.50. What does the function indicate?

• Each ounce of yogurt decreases the cost by $0.37.

• Each ounce of yogurt increases the cost by $0.37.

• Each ounce of yogurt decreases the cost by $1.50.

• Each ounce of yogurt increases the cost by $1.50.

A taxi company charges a flat fee of $3 plus $2 per mile driven. Write the function that represents the total cost (C) as a function of the number of miles driven (m). Then, interpret the rate of change and the initial value.

• C(m) = 2m + 3

• C(m) = 3m + 2

• C(m) = 4m + 1

• C(m) = 5m + 2

A principal wants to predict the number of students who will drop out of school. The equation that represents this data is y = -10x + 216, where x is the # of years & y is the # of students who drop out. Help him predict the number of students who will drop out in 2012.

• 96 students

• 21 students

• 136 students

• 156 students

What type of correlation is shown in this plot?

• Positive

• Negative

• No Correlation

Dorothy loves to make cakes.  The following table shows how the number of eggs that she has left changes as she makes cakes.
What is the meaning of the y-intercept?

• She uses 5 eggs for every 2 cakes.

• She started with 47 eggs.

• She uses 47 eggs for every 0 cakes.

• She started with 5 eggs.

What is the meaning of the y-intercept?

• The weight in the bucket increases by 1 pound per pound of sand.

• Before sand is put in the bucket, it weighs 1 pound.

• The total weight of the sand is 1 pound.

• The weight in the bucket decreases by 1 pound per pound of sand.