B
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
table. 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 graph.
Find the rate of change.
Rate of Change = _______________
Find the slope of the line that passes through each pair of points.
5. (3, -5), (-6, 7)
6. (6, 8), (-4, 8)
B
Find the slope and y-intercept of each equation.
2
7. y  x  3
slope = _____________
5
y-intercept = _________
8. y + 3x = 6
slope = ___________
y-intercept = _____
For each equation express the slope of the line in two ways and then graph the equation.
2
x4
9. y 
10. y  2 x  1
3
11. y 
4
x
3
12. Write the equation of a line in slope
intercept form with the given slope and
y-intercept
slope 
5
2
y-intercept 
3
2
B
Write the slope-intercept form of the equation for each line.
13.
14.
______________________________
______________________
15. Does a vertical line have a slope that is Zero or Undefined? (Note: Vertical is up and down.)
16. A television production company charges a basic fee of $8,000 and then $3,500 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?
B
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:
A
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.