# 1718 WB1Y CH1 (book 2A) Lesson 1

Which of these formulas is a
LINEAR formula?
A
y=x2+2x
B
y=x3
C
y=0.2x3
D
y=2x20.5x3
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Slide 1: Quiz
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This lesson contains 19 slides, with interactive quizzes and text slides.

Lesson duration is: 50 min

## Items in this lesson

Which of these formulas is a
LINEAR formula?
A
y=x2+2x
B
y=x3
C
y=0.2x3
D
y=2x20.5x3

#### Slide 1 -Quiz

Which of these formulas is a
A
y=x2+2x
B
y=x3
C
y=0.2x3
D
y=2x20.5x3

#### Slide 2 -Quiz

Recap: plotting a LINEAR graph
1) Make a table
Top row = Value you fill in = Horizontal axis
Bottom row = Value you calculate = Vertical axis
2) Draw a coordinate system
Use a pencil and geotriangle, use an appropriate scale for each axis, label your axes, use a zigzag if needed
3) Plot the graph
Use a pencil, plot the points, connect with a straight line.

#### Slide 3 -Slide

Example
Plot the graph for the formula                               , take x from -5 to 5.
1) Make a table

y=0.3x50

#### Slide 4 -Slide

Example
Plot the graph for the formula                               , take x from -5 to 5.
1) Make a table

y=0.3x50

#### Slide 5 -Slide

Example
Plot the graph for the formula                               , take x from -5 to 5.
2) Draw a coordinate system

Horizontal axis from -5 to 5, steps of 1.
Vertical axis from -51.5 to -48.5, zigzag and steps of 0.2 or 0.5.
y=0.3x50

#### Slide 7 -Slide

3) Plot the graph                                   Plot the points from the table.

#### Slide 8 -Slide

3) Plot the graph
Connect with a straight line.

#### Slide 9 -Slide

Recap: plotting a PARABOLA
1) Make a table
Top row = Value you fill in = Horizontal axis
Bottom row = Value you calculate = Vertical axis
2) Draw a coordinate system
Use a pencil and geotriangle, use an appropriate scale for each axis, label your axes, use a zigzag if needed
3) Plot the graph
Use a pencil, plot the points, connect with a smooth curve.

#### Slide 10 -Slide

Example
Plot the graph for the formula                               , take x from -5 to 5.
1) Make a table

y=0.5x2+x

#### Slide 11 -Slide

Example
Plot the graph for the formula                               , take x from -5 to 5.
1) Make a table

y=0.5x2+x
Remember:
Use brackets when squaring a negative variable!

#### Slide 12 -Slide

Example
Plot the graph for the formula                               , take x from -5 to 5.
2) Draw a coordinate system

Horizontal axis from -5 to 5, steps of 1.
Vertical axis from -0.5 to 17.5, steps of 1 or 2.

y=0.5x2+x

#### Slide 14 -Slide

3) Plot the graph                                   Plot the points from the table.

#### Slide 15 -Slide

3) Plot the graph
Connect with a smooth curve.

#### Slide 16 -Slide

Solve the equation
3a - 10 = 26

#### Slide 17 -Open question

Recap: solving equations with cards
3a - 10 = 26
3a = 36                            (because 36 - 10 = 26)
a = 12                                (because 3 x 12 = 36)

#### Slide 18 -Slide

Homework Tuesday
Make and correct
R1, R2, R3, R4, R5, R6, R7, R8
from CH1 Linear Formulas in book 2A