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Unit 6 - Practice Test
供稿人: Maher
A caterer charges $120 to cater a party for 15 people 
and $200 for 25 people. Assume that the cost, y, is a 
linear function of the number of x people. Write an 
equation in slope-intercept form for this function. 
What does the slope represent? How much would a 
party for 40 people cost? 
y = 15x + 120
y = 8x + 120
y = 8x
y = 10x + 80
Paul opens a savings account with $350. He saves$150 per month. Write a linear model that representsthe total amount of money Paul deposits into his account after x months. After how many months willPaul have more than $2,000?
y = 150x + 350;  12 months
y = 150x + 350;  3 months
y = -150x + 350;  8 months
350x + 150y = 2000;  11 months
Which equation shows the rule for this graph?
y = 3/4x - 7
y = -4/3x + 7
y = 4/3x + 0/7
y = -3/4x + 7
A
B
C
D
When is Rodney's speed decreasing the most rapidly?
Between B and C
Between D and E
Between E and F
Between F and G
Match each type of correlation to a scenario.
A. No correlation    B.  Positive C.  Negative
The number of hours a person has driven and the 
number of miles driven.
The age of a car and the value of the car.
The age of a house and the number of people
living in the house.
The scatter plot shows the number of CDs (in millions)
that were sold from 1999 to 2005. If the trend
continued, about how many CDs were sold in 2006?
450
650
750
There is no way to know
Write the equation for the line of best fit shown
in the scatter plot.
y = -1/2x + 1
y = 1x - 4
y = 2/3x + 2
y = 2/3x - 4
Which of the three lines shown is the line of best fit?
L1
L2
L3
Which pair of variables would NOT fit the scatter plot.
Age of a tadpole and
length of their tail
A person's height and 
their Math grade
The amount of clothes
purchased and the 
amount of money left
in a person's wallet
Average temperature and
the number of coats sold
If a girl is chosen from the set of girls at random, what
is the probability that she watched the Super Bowl?
40%
20%
38%
8%
Complete the two-way frequency table.
Write the equation of the line that passes through
the points (2, 13) and (-1, -2).
y = 1/5x -2
y = 11/3x + 13
y = 5x + 3
y = -5x -8
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