1. Homework: Text p. 204-206 #11-45 odd
Chapter 3 Review
11/11/15
Today I will review for the Chapter 3 test. I'll know I've got it when I can answer the review questions with 80% accuracy.
Homework: Text p #11-45 odd
Study for tomorrow's Chapter 3 Test
Do Now: While logging into the computer, answer ...
The force F required to stretch a spring varies directly with 
the amount the spring is stretched s. Ten pounds of force 
are needed to stretch a spring 8 inches.
A.) Write a model that relates force F to amount 
  stretched S.
B.) Find the amount the spring is stretched when the 
  force is 20 pounds.
F = s
s = 16 in. 5 4

2. text p. 200-201 # 1-14 answers 2.) f(x) = x - 5 4.) a.) b.) y = 35x
 c.) 280 pages
6.) f(x) = 12x
8.) f(x) = 1/4x + 2
10.) f(n) = 4n - 8; nonproportional because the graph of the line 
does not pass through (0,0)
12.) a.) an=1.65n
 b.) The relationship is proportional.
14.) Neither is correct. The graph represents f(x) = 3x which is 
proportional. The table represents g(x) = 3x - 1 which is not 
proportional because it does not pass through (0,0).

3. Chapter 3 Review Graph Using Table of Values
Determine if an equation is linear
Standard Form
Finding x and y intercepts
Solving Equations Graphically
Finding Slope/Rate of Change
Direct Variation
Arithmetic Sequences
Proportional/Non-proportinal Relationships

4. Suppose y varies directly as x, and y = -6 when x = 9, find y 
when x = -3.
Suppose y varies directly as x, and y = -7 when x = -1, find 
x when y = 0.
x = 0

5. 3y – 4x = 12 x intercept- ( -3, 0) y intercept- (0, 4)
Find the x-intercept and the y-intercept of the line.
Graph the equation and label the intercepts on the 
graph.
3y – 4x = 12
Move me for the answer!
x intercept- ( -3, 0)
y intercept- (0, 4)

6. Solve 3x + 1 = - 2 by graphing. Check your answer algebraically.
Move me for the answer!
x = -1

7. Find the root:
1.) 3x + 1 = 2
x = 1/3
2.) 0 = ½x + 3
x = -6

8. (10, –7) and (5, –7) zero slope m = 4 Find the slope.

9. (3, 5) (1, y) m = -2 (-2, y) (0, 3) m = y = 4 y = 9
Find the value of y so that the line passing 
through the two points has the given slope.
(3, 5) (1, y) m = -2
(-2, y) (0, 3) m =
y = 4
y = 9

10. 1) (5,2), (-7, r), m= 5/6 r = -8 2) (-4, r), (-8,3), m= -5 r = -17
Find the value of r so the line that passes through each 
pair of points has the given slope:
1) (5,2), (-7, r), m= 5/6
2) (-4, r), (-8,3), m= -5
r = -8
r = -17

11. 6x - y = -14 No 1) ½y - 7 = 3x 2) -6xy + 2y = 3x
Determine if the equation is linear. If so, write it in standard form.
1) ½y - 7 = 3x
2) -6xy + 2y = 3x
6x - y = -14 No

12. No, common difference isn't the same
Determine if each sequence is an arithmetic sequence. Explain how you know.
1) -2, 2, -4, 4, -6, 6, ...
2) -6, -3, 0, 3, 6, ...
No, common difference isn't the same
Yes, common difference is +3

13. an = (1/2)n + (5/2) an = -2.5n + 3.5 a13 = -29 1) 3, 3.5, 4, 4.5, ...
Write an equation for the nth term of each arithmetic sequence.
1) 3, 3.5, 4, 4.5, ...
2) 1, -1.5, -4, -6.5, ...
*Use your equation to find the 13th term of this sequence.
an = (1/2)n + (5/2)
an = -2.5n + 3.5
a13 = -29

14. Is the relationship in the chart a function?
Is the relationship in the chart proportional or nonproportional? 
Write an equation to describe the relationship.
proportional
y = 15x 1 3 5 7 9 15 45 75
105
135
# of baskets
Donation ($)
Is the relationship in the chart a function?
yes, function

15. At Memorial Hospital, there were 600 births in 1998
At Memorial Hospital, there were 600 births in 
In 2000, there were 550 births. Find the average rate 
of change in number of births per year. Explain its meaning.
m = -25 births/year
There was a decrease of 25 births per year.

16. The electromotive force, E (in volts), varies directly with the 
current, I (in amperes), flowing through a given conductor. A 
current of 4 amperes passing though the conductor has an 
electromotive force of 8 volts.
Write a model that relates electromotive force E to current I.
What is the electromotive force if 3 amperes pass through the 
conductor?
E = 2I
E = 6 volts

17. The table shows how many points are awarded for 
answering consecutive questions on a gameshow.1 2 3 4 5
200
400
600
800
1000
Question Answered
Points Awarded
1. Does the table of values represent a function? Explain.
2. Is this a proportional relationship? Explain.
3. Write an equation for the given data.
4. How many questions were answered if 1800 points were awarded?
Yes
Yes
P = 200Q
9 questions

18. f(x) = 3x + 3 f(x) = 5x + 4 f(x) = 9x - 2 a = 0 b = 33
no; f(x) = 13x + 13
a = 0
b = 33

19. Write an equation for each graph.
y = -2x + 3
y = 3x

20. Determine which lesson(s) you need more practice in.
Finished early?
Determine which lesson(s) you need more practice in.
Go to connected.mcgraw-hill.com and take the self-check quiz for that lesson.

21. What do you need to study tonight?
Closure
What do you need to study tonight?
Make a plan.