Pre-Algebra
Unit 5 Review
Question #1
•
In which quadrant or on which axis does
each point fall?
a) (0,2)
b) (-4,8)
c) (7,1)
Answer #1
•
In which quadrant or on which axis does
each point fall?
a) (0,2) y-axis
b) (-4,8) 2nd quadrant
c) (7,1) 1st quadrant
Question #2
•
Find the equation of the line containing
the given points.
(0, 7) and (1, 5)
Answer #2
•
Find the equation of the line containing
the given points.
(0, 7) and (1, 5)
m = -2 b = 7
y = -2x + 7
Question #3
•
Find the equation of the line containing
the given points.
(2, 4) and (6, 1)
Answer #3
•
Find the equation of the line containing
the given points.
(2, 4) and (6, 1)
m = -3/4
4 = -3/4(2) + b
4 = -1.5 + b
b = 5.5
y = -3/4 x + 5.5
Question #4
Solve for y:
1. 3x + 5y = 30
2.
x–y=7
Answer #4
Solve for y:
1. 3x + 5y = 30
y = -3/5 x + 6
2.
x–y=7
y=x–7
Question #5
• Graph y = 2x - 5
y
5
-5
5
-5
x
Answer #5
• Graph y = 2x - 5
y
5
-5
5
-5
x
Question #6
Plant Growth
week
1
3
5
7
Height (inches)
10
15
20
25
1.Is the rate of change constant?
2.Are the quantities proportional?
Answer #6
Plant Growth
week
1
3
5
7
Height (inches)
10
15
20
25
1.Is the rate of change constant?
Yes, m = 5/2
2.Are the quantities proportional?
No, 10/1 ≠ 15/3
Question #7
What is the slope of this hill?
20 ft
200 ft
Answer #7
What is the slope of this hill?
m = 20/200 = 1/10
20 ft
200 ft
Question #8
Price of 10 gal. of milk
year
Price ($)
1980
20
1990
24
•What is the domain & range?
2000
28
2010
32
•Is this relation a function? Explain your answer.
•Identify the indep. & dep. variables.
•Is there a constant rate of change, and If there is, what is it?
•Does the table show direct variation? Explain your answer.
Answer #8
•Identify the indep. & dep. variables. Price of 10 gal. of milk
year
Price ($)
Indep = year
1980
20
Dep = price
1990
24
•What is the domain & range?
2000
28
Domain = {1980, 1990, 2000, 2010}
2010
32
Range = {20, 24, 28, 32}
•Is this relation a function? Explain your answer.
Yes, for every input, there is only one corresponding output.
•Is there a constant rate of change, and If there is, what is it?
Yes, 4/10 = 2/5
•Does the table show direct variation? Explain your answer.
no, 20/1980 ≠ 24/1990