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QR Challenge: Substitution

Created using the ClassTools QR Treasure Hunt Generator

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Teacher Notes

A. Prior to the lesson:

1. Arrange students into groups. Each group needs at least ONE person who has a mobile device.

2. If their phone camera doesn't automatically detect and decode QR codes, ask students to

3. Print out the QR codes.

4. Cut them out and place them around your class / school.

B. The lesson:

1. Give each group a clipboard and a piece of paper so they can write down the decoded questions and their answers to them.

2. Explain to the students that the codes are hidden around the school. Each team will get ONE point for each question they correctly decode and copy down onto their sheet, and a further TWO points if they can then provide the correct answer and write this down underneath the question.

3. Away they go! The winner is the first team to return with the most correct answers in the time available. This could be within a lesson, or during a lunchbreak, or even over several days!

C. TIPS / OTHER IDEAS

4. A detailed case study in how to set up a successful QR Scavenger Hunt using this tool can be found here.

Questions / Answers (teacher reference)

Question

Answer

1. What is the first step using substitution? y = 2x and x + 3y = 14. x + 3(2x) = 14
2. What is the first step using substitution? x = y - 3 and 5x + 3y = 1. 5(y-3)+3y=1
3. What is the first step using substitution? y= - 4x and 6x + y = 6. 6x + (-4x) = 6
4. What is the first step using substitution? 2x - 3y = 9 and x = 2y + 2. x
5. Solve for (x, y) using substitution: y = 2 - x and 5x + 4y = 5 (-3, 5)
6. Solve for (x,y) using substitution: y = 5x - 9 and x = y + 5 (1, -4)
7. Solve for (x,y) using substitution: y = 2x and x + 3y = 14 (x,y)
8. Solve for (x,y) using substitution: x = y - 3 and 5x + 3y = 1 (x,y)
9. Solve for (x,y) using substitution: y = -4x and 6x + y = 6 (x,y)
10. Solve for (x,y) using substitution: 2x - 3y = 9 and x = 2y + 2 (x,y)
11. Solve for (x,y) using substitution: 3x - y = 7 and y = 2x - 4 (x,y)
12. Solve for (x,y) using substitution: x = 2y + 7 and 3y - x = 8 (x,y)
13. Solve for (x,y) using substitution: y = x - 4 and 2x - 3y = 11 (x,y)
14. Captain America saw the equations 5x + y = 10 and y = 3 - x. His end result was 5(3 - x) + y = 10. What did he do wrong? He replaced the x instead of the y.
15. Ms. Chan was solving the equations y = 2x and y + x = 1. She then got y + 2x = 1. Is she right? Why or why not? N/A
16. Beyonce had the equation y = 2x + 3 and y = -x - 4. Do you think should she graph them? Or should she use substitution? Which do you think is less work? N/A
17. Batman says “I’m Batman”. He also says there’s only one way to solve the equations 2x - 3y = -2 and y = -4x + 24. Is he right? no, he could graph them or use substitution.
18. Solve for (x,y) using substitution: y = 10 - 2x and 3x - 2y = 22 (x,y)
19. Solve for (x,y) using substitution: 2x - 3y = -2 and y = -4x + 24 (x,y)
20. Solve for (x,y) using substitution: y = 50x + 4 and y - 32x = 40 (x,y)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=What-is-the-first-step-using-substitution?-y-=-2x-and-x-+-3y-=-14.

Question 1 (of 20)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=What-is-the-first-step-using-substitution?-x-=-y---3-and-5x-+-3y-=-1.

Question 2 (of 20)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=What-is-the-first-step-using-substitution?-y=---4x-and-6x-+-y-=-6.

Question 3 (of 20)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=What-is-the-first-step-using-substitution?-2x---3y-=-9-and-x-=-2y-+-2.

Question 4 (of 20)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=Solve-for-(x,-y)-using-substitution:-y-=-2---x-and-5x-+-4y-=-5

Question 5 (of 20)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=Solve-for-(x,y)-using-substitution:-y-=-5x---9-and-x-=-y-+-5

Question 6 (of 20)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=Solve-for-(x,y)-using-substitution:-y-=-2x-and-x-+-3y-=-14

Question 7 (of 20)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=Solve-for-(x,y)-using-substitution:-x-=-y---3-and-5x-+-3y-=-1

Question 8 (of 20)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=Solve-for-(x,y)-using-substitution:-y-=--4x-and-6x-+-y-=-6

Question 9 (of 20)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=Solve-for-(x,y)-using-substitution:-2x---3y-=-9-and-x-=-2y-+-2

Question 10 (of 20)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=Solve-for-(x,y)-using-substitution:-3x---y-=-7-and-y-=-2x---4

Question 11 (of 20)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=Solve-for-(x,y)-using-substitution:-x-=-2y-+-7-and-3y---x-=-8

Question 12 (of 20)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=Solve-for-(x,y)-using-substitution:-y-=-x---4-and-2x---3y-=-11

Question 13 (of 20)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=Captain-America-saw-the-equations-5x-+-y-=-10-and-y-=-3---x.-His-end-result-was-5(3---x)-+-y-=-10.-What-did-he-do-wrong?

Question 14 (of 20)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=Ms.-Chan-was-solving-the-equations-y-=-2x-and-y-+-x-=-1.-She-then-got-y-+-2x-=-1.-Is-she-right?-Why-or-why-not?

Question 15 (of 20)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=Beyonce-had-the-equation-y-=-2x-+-3-and-y-=--x---4.-Do-you-think-should-she-graph-them?-Or-should-she-use-substitution?-Which-do-you-think-is-less-work?

Question 16 (of 20)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=Batman-says-“I’m-Batman”.-He-also-says-there’s-only-one-way-to-solve-the-equations-2x---3y-=--2-and-y-=--4x-+-24.-Is-he-right?

Question 17 (of 20)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=Solve-for-(x,y)-using-substitution:-y-=-10---2x-and-3x---2y-=-22

Question 18 (of 20)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=Solve-for-(x,y)-using-substitution:-2x---3y-=--2-and-y-=--4x-+-24

Question 19 (of 20)

 


Substitution : QR Challenge

https://www.classtools.net/QR/decode.php?text=Solve-for-(x,y)-using-substitution:-y-=-50x-+-4-and-y---32x-=-40

Question 20 (of 20)