# 2TTO §9.2 part 2 Solving equations PTI 20-21

§9.2 Solving equations.
It is so IMPORTANT to LEARN how to
SOLVE LINEAR EQUATIONS
at once IN A GOOD WAY!
That's why we'll PRACTICE it once more, now.
First some explanation:
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Slide 1: Slide
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This lesson contains 20 slides, with interactive quizzes and text slides.

Lesson duration is: 50 min

## Items in this lesson

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

#### Slide 1 -Slide

Solve 8(x-8) = 12x + 5(x + 7 )
Use arrows at the sides.

#### Slide 2 -Slide

Solve 8(x-8) = 12x + 5(x + 7 )

#### Slide 3 -Open question

Solve this equation; use arrows!!

#### Slide 4 -Slide

Example 1:       Solve:
1. take together the like terms (not the case here)
2. take away 10 bags of marbles on one side.   RESULT:

#### Slide 5 -Slide

Solve:  14n + 8 = 10n + 24
• 3. take away 8 loose marbles on one side.   RESULT:

#### Slide 6 -Slide

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

#### Slide 7 -Slide

Example 2:                   Solve:
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

#### Slide 8 -Slide

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
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

#### Slide 9 -Quiz

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

#### Slide 10 -Slide

What is the 2nd step to take?

A. dividing by 41 B. taking away loose marbles on one side
C. taking away bags of marbles on one side
D. dunno

A
dividing by 41
B
taking away loose marbles on one side
C
taking away bags of marbles on one side
D
dunno

#### Slide 11 -Quiz

Now  we have:
What is the 3rd step?

#### Slide 12 -Slide

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 13 -Slide

1 = 11n, so n = .....

#### Slide 14 -Mind map

Below you do not only see the last step, but the whole Solution!
This is the way it is written.

#### Slide 15 -Slide

One more 'new' thing ..... (exerc. 16)
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 16 -Slide

Here you see how to
solve this one!
at the end.

#### Slide 17 -Slide

Before doing the homework ...
Make sure you know how to write down the solutions to the equations! (so: not just the answers!)

Not sure about doing all this, yet? Take a little more time preparing.
HOW ?!                          See next slide!

#### Slide 18 -Slide

Before doing the homework,
Lean back and WATCH these FEEL GOOD Movies:
Watch some Movies FIRST, making it easier(!):

+ the Moderne Wiskunde movie from §9.2; go to the digital book!

#### Slide 19 -Slide

Homework time
Make the exercises
Use the arrows