Calculating with letters

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 1

Everybody stand up!!!

What did we learn last lesson?

Which steps do we take to make a graph?

1. Make a table
2. Plot the coordinates
3. Draw the graph

Linear VS Quadratic

What is the difference with quadratic and linear with:

• Table
• Graph
  

Exercise

Plot the graphs of the following formulas:

Which one is linear and which is quadratic?

(10 minutes)

y=x​2​​−4

y=2x−1

Calculating with letters

n+n+n+n+n+n+n=?

The sum of like terms!

Multiplying

1. Multiplying the numbers

5n⋅3k⋅−2l=

5⋅3⋅−2⋅n⋅k⋅l=

−30⋅n⋅k⋅l=

2. Write down the letters in alphabetical order.

−30⋅k⋅l⋅n=

3. Leave out all the multiplication signs.

−30kln

Exercise

If you are finished with these go on doing exercise 45

3x⋅2y=

5b⋅−a=

−k⋅2p⋅5m=

Adding like terms

What are like terms?

Add only the like terms!

3a+4b+2a+b=

3+2p+8+p=

Homework

Introductory:37,41,42,43,44,48

Standard:35,38,45,46,47,49,50,51,52

Extension:39, page 47q6 and q7

Class notebook: Gijs, Justin, Eva, Ward, Olivia