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Math 8 LG14 Unit 4 Practice Test #5



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

 1. 

Four more than three times a number is 16. Let n represent the number. Solve for n.
a.
13
b.
9
c.
-4
d.
4
 

 2. 

Write an equation for this sentence.
40 less than a number is 10.
a.
mc002-1.jpg
c.
mc002-3.jpg
b.
mc002-2.jpg
d.
mc002-4.jpg
 

 3. 

Write an equation for this situation.
Each of 5 people contributed $y to buy a gift that costs $20.
a.
mc003-1.jpg
c.
mc003-3.jpg
b.
mc003-2.jpg
d.
mc003-4.jpg
 

 4. 

Write an equation for this sentence.
A number divided by 4 is 11.
a.
mc004-1.jpg
b.
mc004-2.jpg
c.
mc004-3.jpg
d.
mc004-4.jpg
 

 5. 

Solve this equation. mc005-1.jpg
a.
-32
b.
32
c.
-12
d.
12
 

 6. 

Evaluate. 2(5 + 8)
a.
26
b.
18
c.
21
d.
15
 

 7. 

Evaluate. mc007-1.jpg
a.
6
b.
–26
c.
–54
d.
3
 

 8. 

Expand. mc008-1.jpg
a.
mc008-2.jpg
b.
mc008-3.jpg
c.
mc008-4.jpg
d.
mc008-5.jpg
 

 9. 

Solve this equation: mc009-1.jpg
a.
mc009-2.jpg
b.
mc009-3.jpg
c.
mc009-4.jpg
d.
–5
 

 10. 

Solve this equation: mc010-1.jpg
a.
mc010-2.jpg
b.
–2
c.
mc010-3.jpg
d.
–4
 

 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. 

Graph the relation y = –2x + 3 for integer values of x from 0 to 4.
a.
mc012-1.jpg
c.
mc012-3.jpg
b.
mc012-2.jpg
d.
mc012-4.jpg
 

 13. 

Describe the relationship between the variables x and y in this graph.
Graph of mc013-1.jpg
mc013-2.jpg
a.
When x increases by 1, y increases by 2.
b.
When x increases by 1, y increases by 5.
c.
When x increases by 1, y increases by 7.
d.
When x increases by 2, y decreases by 5.
 

 14. 

Complete the table of values for the linear relation mc014-1.jpg.
mc014-2.jpg
a.
mc014-3.jpg
c.
mc014-5.jpg
b.
mc014-4.jpg
d.
mc014-6.jpg
 

 15. 

Which relations have graphs that are lines going up to the right?
i)      mc015-1.jpg
ii)      mc015-2.jpg
iii)      mc015-3.jpg
iv)      mc015-4.jpg
a.
ii and iv
b.
i and iii
c.
ii
d.
i, ii, and iv
 

Short Answer
 

 16. 

In the left pan of a set of balance scales, there are 3 identical unknown masses and a mass of 5 g.
The scales are balanced by placing a mass of 20 g in the right pan.
Find each unknown mass.
 

 17. 

Solve this equation. sa017-1.jpg
 

 18. 

Solve this equation. sa018-1.jpg
 

 19. 

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.
 

 20. 

Ivan wants to buy a skateboard that costs $45. He plans to save $3 per week.
How many weeks will it take him to save $45?
a)      Write an equation you can use to find how many weeks it will take Ivan to save $45.
b)      Solve the equation and answer the question.
 

 21. 

Miranda opened a checking account with $560. She withdrew the same amount each week for 13 weeks. Her balance was then $365.
a)      Write an equation you can use to find how much money Miranda withdrew each week.
b)      Solve the equation and solve the problem.
 

 22. 

Write an equation for this sentence, then solve the equation.
A number divided by -7 is -8.
 

 23. 

Which pairs of expressions are equivalent?
a)      9(q + 2) and 9q + 2
b)      7(t + 5) and 7t + 35
c)      8(y + 3) and 8y + 11
d)      9(x + 5) and 9x + 45
 

 24. 

Write a formula for the perimeter, P, of this hexagon 2 different ways.
sa024-1.jpg
 

 25. 

Solve this equation: sa025-1.jpg
 

 26. 

Saja and 10 friends went to a fair. The cost of admission was $8 per person.
They each bought an unlimited midway ride ticket.
The total cost of admission and ride tickets for Saja and her friends was $319.
What was the price of an unlimited ride ticket?
a)      Write an equation to model the problem.
b)      Solve the equation and answer the question.
 

 27. 

Make a table of values for the relation sa027-1.jpg for integer values of x from –3 to 3.
 

 28. 

The graph shows the linear relation sa028-1.jpg.
Describe the relationship between the variables x and y.
sa028-2.jpg
 

 29. 

Graph the relation sa029-1.jpg for integer values of x from 0 to 5.
Describe the relationship between the variables x and y in the graph.
 

 30. 

Graph the relation sa030-1.jpg for integer values of x from -4 to 4.
 

Problem
 

 31. 

Sketch a balance-scales model to represent this equation:
pr031-1.jpg
Solve the equation for x. Show your work.
 

 32. 

Describe how you model the equation 3x + 7 = 31 using balance-scales.
Use the model to solve the equation for x.
 

 33. 

You are a member of a movie club. Every time you see a movie, you earn 2 advantage points.
When you earn 100 points, you get a free movie ticket. Now you have 64 advantage points.
Write an equation to show the number of movies you have to watch before you earn a free movie ticket.
 

 34. 

Keith went to a garden centre and bought some potting soil for $13 and 6 shrubs.
If the total cost was $67, how much did each shrub cost if they were priced the same?
Write an equation you can use to solve the problem. Verify the solution.
Show your work.
 

 35. 

A student’s work is shown. Check this student’s work.
Rewrite a correct algebraic solution where necessary.
pr035-1.jpg
 

 36. 

I think of a number, divide it by 6, then add 4.
If the result is 17, what is the original number?
Explain your work.
 

 37. 

The length of each side of an equilateral triangle is increased by 5 cm.
The perimeter of the new triangle is 72 cm. What was the side length of the original triangle?
a)      Write an equation that can be solved using the distributive property.
b)      Solve the equation and verify the solution.
 

 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. 

A box contains 8 candies. The candies have to be shared between Cam and Kathy.
Let c represent the number of candies Cam gets and k represent the number that Kathy gets.
An equation for this relation is pr039-1.jpg.
a)      Create a table of values for the relation.
b)      Graph the relation.
c)      Which ordered pair suggests the fairest way to share the candies?
 

 40. 

a)      Graph each relation for integer values of x from -3 to 3.
      i)      pr040-1.jpg
      ii)      pr040-2.jpg
      iii)      pr040-3.jpg
      iv)      pr040-4.jpg
b)      Which graphs go up to the right? Which graphs go down to the right?
c)      How can you use the equation of a linear relation to tell if its graph goes up or goes down to the right?
 



 
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