A
6.1 – 6.3 Test
Name ____________________________
Period # ________
Directions: Show all work to receive full credit.
1. Describe the trend in the scatter plot
below as positive correlation, negative
correlation, or no correlation.
_________________________________
3. The rate of change is constant in the
graph. Find the rate of change.
Rate of Change = ______________
2. Find the slope of the line below.
slope = _________________
4. The rate of change is constant in the table.
Find the rate of change.
Rate of Change = ______________
Find the slope of the line that passes through each pair of points.
5. (9, 5), (-3, 5)
6. (5, -2), (-7, 6)
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Find the slope and y-intercept of each equation.
4
x6
7. y 
slope = _______________
5
y-intercept = _____________
8. y + 2x = 8
slope = __________
y-intercept = ________
For each equation express the slope of the line in two ways and then graph the equation.
2
9. y  x  4
10. y  2 x  3
3
11. y 
4
x
3
12. Write the equation in slopeintercept form with the given slope
and y-intercept.
slope 
2
7
y-intercept 
5
7
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Write the slope-intercept form of the equation of each line.
13.
14.
_____________________
_____________________
15. Does a horizontal line have a slope of Zero or Undefined? (Note: Horizontal is side to side.)
16. A television production company charges a basic fee of $9,500 and then $4,000 per hour
when filming a commercial.
a.) Define the variables in the situation.
x = _____________________
y = _____________________
b.) Write an equation in slope-intercept form relating the basic fee and per-charge. (Slopeintercept form is y  mx  b ).
c.) If 4 hours of filming was needed what would be the total production cost for the
commercial?
A
17.The scatter plot below shows the number of CDs (in millions) that were sold from 1999 to 2005.
Use the scatter plot to answer the following questions:
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a) Describe what information point A gives you.
b) Does the graph have positive, negative, or no correlation?
c) Describe what the correlation means in context of the problem.
d) Draw a line of best fit on the graph. If the trend continued, predict how many CDs were sold
in the year 2006.