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# Pick up your new packet and find your seat. Silently start your warm-up for Tuesday. - PowerPoint PPT Presentation

Welcome Back!. Tuesday. What is the slope of the line -5x – 2y = 22?. Pick up your new packet and find your seat. Silently start your warm-up for Tuesday. IW. Learning Target:. IWBAT write the equation of a perpendicular line in various situations.

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Presentation Transcript

Welcome Back!

Tuesday

What is the slope of the line

-5x – 2y = 22?

Silently start your warm-up for Tuesday.

IW

Learning

Target:

IWBAT write the equation of a perpendicular line in various situations.

Silently work on your Warm Up

You have 5 minutes

Learning

Target:

Learning

Target:

IWBAT write the equation of a perpendicular line in various situations.

Don’t forget to write your Learning Target

You have 4 minutes

Learning

Target:

IWBAT demonstrate several ways it is importantto solve for y

Learning

Target:

IWBAT write the equation of a perpendicular line in various situations.

Make Sure You Answer All of the Questions

You have 3 minutes

Learning

Target:

IWBAT demonstrate several ways it is importantto solve for y

Learning

Target:

IWBAT write the equation of a perpendicular line in various situations.

You have 2 minutes

Learning

Target:

IWBAT demonstrate several ways it is importantto solve for y

Learning

Target:

IWBAT write the equation of a perpendicular line in various situations.

Time’s Almost Up!Make sure you have your name on BOTH sides of your AEM

You have 1 minute

Learning

Target:

IWBAT demonstrate several ways it is importantto solve for y

Learning

Target:

IWBAT write the equation of a perpendicular line in various situations.

Warm-Up Review Time!!!

Eyes up Front

Mouths Closed

Ears Listening

Warm Up Check

2. Solve for y

3x + y = 12

What is the slope of the line

-5x – 2y = 22?

IWBAT demonstrate several ways it is importantto solve for y

Learning

Target:

IWBAT write the equation of a perpendicular line in various situations.

Slopes of Perpendicular Lines

Find the slope of each line:

Slope (m) of line A: _________

Slope (m) of line B: _________

Slope (m) of line C: _________

A

B

3/2

3/2

C

-2/3

What do you notice about the slopes of A and B?

________________________________________________________________

The slopes are the same

Slopes of ____________ lines are ___________________!

parallel

the same

What do you notice about the slopes of B and C?

__________________________________________________________________

The slopes different; opposite; reverse, upside down; flipped

perpendicular

Slopes of __________________ lines are _____________________ _____________________!!

opposite

reciprocals

What’s an opposite reciprocal?

EXAMPLES:

3

-1/3

sign

OPPOSITE – change the ___________

RECIPROCAL - ___________!

7/5

-5/7

flip it

_____ AND _____

_____ AND _____

EX 1

• Use the following clues to write an equation for Line A.
• Line A has a y-intercept of -1.
• Line A is perpendicular to the line
• y = 4x + 3
• Equation for Line A: _____________________

y = -1/4x - 1

EX 2

• Line K is perpendicular to the line y = -5x + 4.
• Line K contains the point (3,3).

1/5

Slope (m) : ________________

Y-intercept (b) : ____________

Equation of line:

_______________________

2.4

y = 1/5x + 2.4

EX 3

Write the equation of the line that goes through (4, -5) and is perpendicular to the line y = 4x + 4.

What is the slope of your new line?

-1/4

1

Find the y-intercept (Plug into y = mx + b)

2

Now put it all together….

The equation of the line is: _______________________

y = -1/4x - 4

You try it!

Write the equation of the line that goes through (0, 4) and is perpendicular to the line y = 3x.

The equation of the line is: _______________________

y = -1/3 + 4

For the Rest of Class work on the problems on Page 5 and 6. If you get done early, start your homework – Page 9