Friday, April 30, 2010

Solving one-step equations

1. Using inspection, mental math

Eg. a + 4 = 12
8 + 4 = 12
12 = 12

Ask yourself what something + 4 = 12 or 12 - something = 4

Try these:

14 = k + 5
14 = 9 + 5

t - 3 = 11
14 - 3 = 11

10 - y = 8
10 - 2 = 8

2. Model (make a picture) and solve


Bill rides 4 km to the bridge then rides to work. In total he rides 11 km. How far from the bridge to work?

4 + y = 11

4 + 7 = 11

3. Apply the opposite operation

Eg. c + 22 = 56
- 22 = -22
c = 34

Check- c + 22= 56
34 + 22 = 56
56 = 56

1st step - Isolate the variable (get the letter by itself)

2nd step - Apply the opposite operation

3rd step - Check your answer. Substitute the answer for the letter of the original equation

Opposite operation - An operation that "undoes" another operation
* subtraction and addition are opposites
* division and multiplication are opposites

Solve by applying the opposite operating - Check your answer:

1. n + 7 = 26
- 7 = -7
n = 19

Check - n + 7 = 26
19 +7 = 26
26 = 26

2. d - 3 = -5
+3 = +3
d = -2

Check - d - 3 = -5
(-2) - 3 = -5
-5 = -5

Page 398-401 # 1-22 is HOMEWORK!


  1. Great job Kristel! Your post was easy to understand and you covered everything we learned in class. I liked the colours and pictures you useed, I also liked how you put a link to get to for those of us who cannot get to the website. One thing I suggest to you is to maybe put a video, but thats ok. Overall great post:)

  2. Really great job Kristel! I liked your post a lot. You included everything we did in class. I liked the colours you used and your pictures were great, they drew my attention, but weren't distracting. Everything made sense. Thanks for including the homework. Great job Kristel!(:

  3. Great job, Kristel! You post was nice and clear. You also included everything we did in class. I liked your colors and pictures. You could have added a link or a video, but other than that, great job! Thanks for also putting up the homework.

  4. Kristel, I thought you did a fantastic job! I really enjoyed all of your examples, along with your pictures. It looks like you took a lot of effort in your post. On the other hand, I suggest you add a video and also a link. Other than that, you did a fantastic job! Keep up the good work.

  5. GREAT JOB KRISTEL! you explained it very well just like the notes, and your pictures was colourful and very easy to understand, and you also added colours..I think you should add a video or a link just in case some people dont understand the notes..but other than that GREAT JOB! :D

  6. Good job Kristel!Did a good job of explaining everything.I think you pretty much covered everything but the video..But that's okay.But anyway..Good job!

  7. Good job! I like the pictures that you used and your explaining for the things was very clear. I liked how you changed the font size and the colours, and you added the homework reminder. good job!

  8. Great Post Kristel! You did alot of good things , like add colour, and add pictures to make people or the students understand what you were trying to say. GOOD JOB, but next time maybe add a video. It could help alot, but other than that. Great post !

  9. Good Job! The use of color is pretty nice. Everything was explained very well and the pictures are very helpful. Good Job!

  10. Good Job Kristel ! The colours were really nice. you could of put some pictures in. The last thing is try putting a video . Anyways Excellent Job . :]

  11. I have always loved your postes they are always so bright and understandable.

  12. Good job. I really liked your very colouful text and pictures. Your post was very easy to understand. Your link made sense as there was homework to do, but you could add a video so people will understand the subject more. Good job again.:)

  13. good job kristel .you did every thing good the colour and the picture. next time you should of put a video but still awesome job

  14. really good job kristale i like it.i really like all the colour you added and stuff!!:)

  15. Good post Kristel(: I like how you included pictures and you changed the colour for headings. Next time, try to find a video or a link.

  16. I love your pictures, Kristel!!! Where did you find them? Anyway, you did a really good job, except I don't think I saw any video on the blog... anyway I love the color and everything is amazing!! Excellent Job!!! XD! ^__^

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  18. Great job Kristel. it was colour