- 123 Views
- Uploaded on

Math

Download Presentation
## PowerPoint Slideshow about 'math' - schwa2aj

**An Image/Link below is provided (as is) to download presentation**

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript

Solve for a Variable

- A variable represents a number
- We do not know the number
- X will be the variable
- We will solve for X

Equation Form

- 2X + 4 = 10
- X – 3 = 7
- 5X – 10 = 20 – 5X

Basic Rules

- Get X by itself
- Note: If you preform an operation to one side, you also must preform the same operation to the other side.

Lets Try Examples

- Ex 1

3X + 5 = 20

-5 -5

3X = 15

÷3 ÷3

X = 5

- Ex 2

1/2X – 10 = 0

+10 +10

1/2X = 10

x2 x2

X = 20

Check the Answers

- Plug in your value for X -

- Ex 1

3(5) + 5 = 20

15 + 5 = 20

20 = 20

- Ex 2

½(20) – 10 = 0

10 – 10 = 0

0 = 0

Solve for Inequalities

- What is an Inequalities
- < Less then
- > Greater then
- < Less then or equal to
- > Greater then or equal to

Examples of Inequalities

- X + 3 < 5
- 2X – 6 > 8
- 4X + 2 < 10
- -6X – 10 > 20

Solve for Inequality

- Solve same as Equation
- Get X by itself
- X = ?

Rules of Inequalities

- Same rules as equations
- With one exception:
- When dividing by a negative you must switch the direction of the sign.

Lets Try Examples

- Ex 1

-2X – 10 < 4

+10 +10

-2X < 14

÷(-2) ÷(-2)

X > -7

- Ex 2

3X + 15 > 9

-15 -15

3X > -6

÷3 ÷3

X > -2

Graph an Inequality

- < = ) Less then
- > = ( Greater then
- < = ] Less then or equal
- >= [ Grater then or equal

Download Presentation

Connecting to Server..