# 2Tvwo §9.2 Solving equations

§9.2 Solving equations.
It is  IMPORTANT to LEARN how to
SOLVE LINEAR EQUATIONS
IN A GOOD WAY!
That's why we'll PRACTICE it once more, now.
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Slide 1: Slide
WiskundeMiddelbare schoolvwoLeerjaar 2

This lesson contains 21 slides, with interactive quizzes and text slides.

Lesson duration is: 50 min

## Items in this lesson

§9.2 Solving equations.
It is  IMPORTANT to LEARN how to
SOLVE LINEAR EQUATIONS
IN A GOOD WAY!
That's why we'll PRACTICE it once more, now.

#### Slide 1 -Slide

Example 1:       Solve:
1. take together the like terms (not the case here)
2. remove 10 bags of marbles on both sides.   RESULT:

#### Slide 2 -Slide

Solve:  14n + 8 = 10n + 24
• 3.   remove 8 loose marbles on both sides.   RESULT:

#### Slide 3 -Slide

Solve:      14n + 8 = 10n + 24
4. calculate n by dividing by 4 ON BOTH SIDES:

#### Slide 4 -Slide

What is the 1st step to take? Choose from:
A. remove loose marbles on both sides              B. divide by 34
C. remove bags of marbles on both sides          D. taking together like terms

#### Slide 5 -Slide

34n + 15 + 7n = 52n + 4
What is the 1st step to take?
A. take away loose marbles on one side B. divide by 34
C. take away bags of marbles on one side
D. taking together like terms
timer
0:20
A
take away loose marbles on both sides
B
divide by 34
C
take away bags of marbles on both sides
D
taking together like terms

#### Slide 6 -Quiz

We have:
What is the 2nd step to take?    Choose from:
A.    dividing by 41                                       B. taking away loose marbles on one side
C.     taking away bags of marbles on one side      D. dunno

#### Slide 7 -Slide

What is the 2nd step to take?

41n + 5 = 52n + 4

Solve: 41n + 5 = 52n + 4
The right step to take is now:
A. dividing by 41
B. taking away loose marbles on one side
C. taking away bags of marbles on one side
D. dunno

timer
0:20
A
dividing by 41
B
taking away loose marbles on both sides
C
taking away bags of marbles on both sides
D
dunno

#### Slide 8 -Quiz

Now  we have:
What is the 3rd step?
Key it in in the next slide!

#### Slide 9 -Slide

timer
0:20
5 = 11n + 4
3rd step: ........ = ...........

#### Slide 10 -Mind map

Below you see the 3rd step: taking away 4 loose marbles.
One step to go!
key the final result in in the next slide.

#### Slide 11 -Slide

timer
0:20
1 = 11n, so n = .....

#### Slide 12 -Mind map

Below you do not only see the last step, but the whole Solution!
This is the way it is written,
and so it shall be done!
from §9.2, today.

#### Slide 14 -Slide

One more 'new' thing .....
Using 'brackets' is
not really new, of course,
but IT IS, in an equation!
It just asks for one more step:
The new 1st step now becomes:  REMOVE THE BRACKETS.

#### Slide 15 -Slide

Here you see how to
solve this one!
Bye the way,
you do not HAVE TO
CHECK, if you are sure

#### Slide 16 -Slide

Before doing the homework ...
Here's a MISTAKE I ask you to correct in your own textbook:
The part  ... '+ 6' ...
has to be:
... '+3' ...

#### Slide 17 -Slide

Not so sure of yourself yet?
In the next two slides you will find two MOVIES about:
-  solving equations like in §9.1
-  solving equations like in §9.2, so including brackets!
-  I will share this Lessonup with you, so you can watch
these MOVIES and the whole content, for that matter.

#### Slide 20 -Slide

Homework time
§9.2
Do 14  t/m   17
Only 4 tasks, but ... work them all out in the good way!
STUDY and USE  the METHOD on p.93  and the THEORY on p.94,