Name: 
 

Math 8 LG14 Unit 4 Practice Test #2



Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

Use this balance-scales model to solve for x.
mc001-1.jpg
a.
10
b.
6
c.
14
d.
–10
 

 2. 

In the left pan of a set of balance-scales, there are 2 identical unknown masses and a mass of 18 g.
The scales are balanced by adding a mass of 24 g to the right pan.
Find the value of each unknown mass.
a.
6 g
b.
3 g
c.
4 g
d.
–6 g
 

 3. 

Write an equation for this sentence.
40 less than a number is 10.
a.
mc003-1.jpg
c.
mc003-3.jpg
b.
mc003-2.jpg
d.
mc003-4.jpg
 

 4. 

Solve this equation. 14 – 2x = 6
a.
4
b.
14
c.
–10
d.
–3
 

 5. 

Write an equation for this sentence.
A number divided by 4 is 11.
a.
mc005-1.jpg
b.
mc005-2.jpg
c.
mc005-3.jpg
d.
mc005-4.jpg
 

 6. 

Expand. mc006-1.jpg
a.
4x + 7
b.
4x + 28
c.
4 + x + 7
d.
28x
 

 7. 

Solve this equation: mc007-1.jpg
a.
mc007-2.jpg
b.
mc007-3.jpg
c.
mc007-4.jpg
d.
–5
 

 8. 

The price of an electronic puzzle was reduced by $7.
Mr. Murray bought 10 puzzles for his relatives. The total cost before taxes was $130.
What was the original price of the puzzle?
a.
$7.65
b.
$20.00
c.
$6.00
d.
$127.00
 

 9. 

Doreen chose an integer. She added 4, then multiplied the sum by –3.
The product was –15. What integer did Doreen start with?
a.
mc009-1.jpg
b.
–1
c.
1
d.
0
 

 10. 

Complete this table of values for the relation mc010-1.jpg.
mc010-2.jpg
a.
mc010-3.jpg
c.
mc010-5.jpg
b.
mc010-4.jpg
d.
mc010-6.jpg
 

 11. 

Complete this table of values for the relation mc011-1.jpg.
mc011-2.jpg
a.
mc011-3.jpg
c.
mc011-5.jpg
b.
mc011-4.jpg
d.
mc011-6.jpg
 

 12. 

Complete this table of values for the relation mc012-1.jpg.
mc012-2.jpg
a.
mc012-3.jpg
c.
mc012-5.jpg
b.
mc012-4.jpg
d.
mc012-6.jpg
 

 13. 

Make a table of values for the relation mc013-1.jpg for x = 1, 2, 3, and 4.
a.
mc013-2.jpg
c.
mc013-4.jpg
b.
mc013-3.jpg
d.
mc013-5.jpg
 

 14. 

The ordered pair (  , 5) is in the linear relation with equation mc014-1.jpg.
Find the missing number in the ordered pair.
a.
3
b.
mc014-2.jpg
c.
6
d.
–6
 

 15. 

Describe the relationship between the variables x and y in this graph.
Graph of mc015-1.jpg
mc015-2.jpg
a.
When x increases by 1, y decreases by 12.
b.
When x increases by 1, y decreases by 2.
c.
When x increases by 1, y increases by 2.
d.
When x increases by 2, y increases by 12.
 

Short Answer
 

 16. 

Use this balance-scales model to solve for x.
sa016-1.jpg
 

 17. 

A set of balance scales has an unknown mass and a mass of 4 g in its left pan.
The scales are balanced by adding a mass of 21 g to the right pan.
Find the unknown mass.
 

 18. 

What is the mass needed to balance these scales?
sa018-1.jpg
 

 19. 

Solve this equation. sa019-1.jpg
 

 20. 

Solve this equation. sa020-1.jpg
 

 21. 

Jacqui has $56 in her savings account. She saves $25 each week.
How long will it take before she has $406 in her account?
Write an equation, then solve the problem.
 

 22. 

Solve this equation. sa022-1.jpg
 

 23. 

Which value, 4, 6, or 8, is the correct solution to the equation sa023-1.jpg? Explain.
 

 24. 

Expand. sa024-1.jpg
 

 25. 

This hexagon has a perimeter of  52 cm. What is the length of the side marked a?
sa025-1.jpg
a)      Write an equation to find the length of side a that involves the distributive property.
b)      Solve the equation and answer the question.
 

 26. 

Solve this equation: sa026-1.jpg
 

 27. 

The equation of a linear relation is sa027-1.jpg. Which ordered pairs are NOT in the relation?
A(3, –1), B(7, –13), C(8, –16), D(9, –20)
 

 28. 

Iris has $240 in the bank and she withdraws $25 every week.
An equation for this relation is sa028-1.jpg, where c represents the amount of money, in dollars, in Iris’ account and w represents the number of weeks.
How much does Iris have in her account after 4 weeks?
 

 29. 

This table of values is for the linear relation with equation sa029-1.jpg, where b is a constant.
Find the value of b.
sa029-2.jpg
 

 30. 

This graph shows the linear relation sa030-1.jpg.
Describe the relationship between the variables x and y.
sa030-2.jpg
 

Problem
 

 31. 

If  a star has a value of 26, what is the value of the happy face?
What can you say about the value of the diamond shape?
pr031-1.jpg
 

 32. 

Expand. pr032-1.jpg
Show your work.
 

 33. 

a)      Write a formula for the perimeter, P, of this hexagon 2 different ways.
b)      Find the perimeter of the hexagon when a = 4 cm and b = 8 cm.
pr033-1.jpg
 

 34. 

Simplify this expression. pr034-1.jpg
Show your work.
 

 35. 

Carmel used the distributive property to solve this equation: pr035-1.jpg
Here’s her work.
pr035-2.jpg
a)      Check Carmel’s work. Is her solution correct?
b)      If your answer is yes, verify the solution. If your answer is no, describe the error, then correct it.
 

 36. 

The length of a rectangle is 5 cm more than its width.
a)      Write a formula for the perimeter, P, of the rectangle that involves the distributive property.
b)      Find the length and width of the rectangle if the perimeter is 58 cm. Show your work.
 

 37. 

Make a table of values for the relations pr037-1.jpg and pr037-2.jpg.
For what value of x will the relations have the same y-value?
 

 38. 

Make a table of values for the relation pr038-1.jpg for integer values of x from –3 to 3.
a)      Find the value of y when x = 7.
b)      Find the value of x when y = 7.
c)      Estimate the value of y when x = 1.5.
 

 39. 

Barb makes and sells calendars.
The cost of making a batch of calendars is $1050 and Barb can sell each calendar for $7.
If s represent the number of calendars sold and p represents Barb’s profit in dollars, an equation for this relation is pr039-1.jpg.
a)      How many calendars does Barb have to sell to cover the cost of making a batch of calendars?
b)      What is Barb’s profit if she sells 180 of the batch of calendars?
Show your work.
 

 40. 

a)      Graph both relations on the same coordinate axes.
      i)      pr040-1.jpg
      ii)      pr040-2.jpg
b)      Find the ordered pair on the graph that are in both relations.
 



 
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