1Tvwo §9.5 Using cards PART 2

§ 9.5 Using cards  PART 2
As the Method of SOLVING EQUATIONS is that important,
we do this paragraph in two lessons!
This should make it quite possible for you to work it all out
as the METHOD on p.111 shows you!

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Slide 1: Slide
WiskundeMiddelbare schoolhavo, vwoLeerjaar 1

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

time-iconLesson duration is: 45 min

Items in this lesson

§ 9.5 Using cards  PART 2
As the Method of SOLVING EQUATIONS is that important,
we do this paragraph in two lessons!
This should make it quite possible for you to work it all out
as the METHOD on p.111 shows you!

Slide 1 - Slide

 RECAP:
refreshing your memory!
an EQUATION is something like:    23 = 7t + 9
the SOLUTION to this is:  t = 2,  because 23 = 7 x 2 + 9  , or
                                                                                    23 =  14  + 9 
                                                                                    this checks out!

Slide 2 - Slide

In the previous paragraph you have seen what an equation looks like and how to find a solution.
In this paragraph we will use a method called "using cards" to solve our equation.

You put a card over the term with the variable and decide what number should be written on the card.

Then you know that the term with the variable is equal to that number.

Slide 3 - Slide

Slide 4 - Slide

Slide 5 - Slide

Slide 6 - Slide

Slide 7 - Slide

This was a recap from last lesson (1st part of §9.5)
Now the 2nd part comes up:
on p.112 you find tasks that ask from you to:
-  make a formula for a story
-  fill in a number in that formula and finally
-  solve the equation that results from all this

Slide 8 - Slide

Task 1 follows soon ...

But first a JOKE!
By the way, the book in the next slide is called:
'How to become a millionaire.'

Slide 9 - Slide

Slide 10 - Slide

Task 36 we'll do together right now. 
Let's make it  in your Notebook, now!
+  Let's first read it together.
+ TASK 1:   Make a FORMULA for Kirsten's hair length in cm (= l)  and the months 
     she is growing it (= m). THINK ABOUT THE GENERAL SHAPE OF A FORMULA!
+ One important detail:  12.5 mm = 1.25 cm !
    Use cm only -not mm- in your Formula.

timer
1:00

Slide 11 - Slide

Length Kirsten's hair in a FORMULA
(the numbers 10, 1.25
and the words/letters: length and months
have to be in it!):

Slide 12 - Mind map

Now we have our formula:
length = 10 + 1.25 x months

It's handier to use a shortened version:
l = 10 + 1.25m

Slide 13 - Slide

Solution Task 1:

Slide 14 - Slide

TASK 2:   Now we are gone make the equation. Fill in 35 for the length

Here's the FORMULA once more:
l = 10 + 1.25m

timer
1:00

Slide 15 - Slide

The equation will be (by filling in 35 for the length)

Slide 16 - Mind map

Task 3: Calculate how many months it takes her hair to be at least 35 cm long.
35 = 10 + 1.25m


timer
1:00

Slide 17 - Slide

Solve the equation: 35 = 10 + 1,25m

Slide 18 - Mind map

Solution Task 2:

Slide 19 - Slide

Homework
§9.5 Do exercises 35, 37, C9, C10
Check your answers with the solutionsbook in Teams.


 

Slide 20 - Slide

Solve the equation using cards

A
q=72
B
q=3
C
q=8
D
q=9

Slide 21 - Quiz