Objective: SWBAT…Graph compound inequalities

Sam is 9 years old. This is seven years younger than her sister Rose's age. What is Rose’s age?Create an equation from this verbal scenario to calculate the unknown, Rose’s age.Solve the equation.

Homework: TextbookReview: P81-84 Do: p. 85 -87: 50, 51, 54, 75

•5 minutes•4 minutes•3 minutes•2 minutes•1 minute•30 seconds•TIMES UP!!!

Expressions and Equations

Homework: TextbookReview: P81-84 Do: p. 85 -87: 50, 51, 54, 75

Expressions are:

General little statements that DO NOT have an equals sign!

• 2x – 4• 2m³ + 5m• Seven less than half a number

squared• Twice the difference of a number and

five

Equations are:

Any statement that DOES have an equals sign (or equivalent):

• 4n + 7 = 11• ½ b – 2 = 3• Twice a number increased by four is

ten• The difference of a number and two

is five

What you will be doing today:

• Writing verbal expressions and equations from algebraic forms

• Writing algebraic expressions and equations from verbal forms

What does THAT mean?

It means you will take an expression like 3x – 5, and write it as: “the difference of three times a number and five” or maybe “ five less than three times a number”

Or maybe……If you are given the verbal sentence, you will

write it as an algebra equation or expression:

“half of a number increased by three is twelve” would be written as : ½ x + 3 = 12

What will you need to know to be able to do this? Words for addition, such as “more than”

or “increased by” Words for subtraction, such as “less

than” or “decreased by” Words for multiplying or dividing, such as

“product of” or “quotient” Words for powers of numbers, like

“squared” or “cubed” Words for where the equals sign goes,

like ‘is” or “is equal to” or “is the same as”

Warning!!

Do not use the words “plus” or “minus”

or “equals”

if at all possible !!

Your turn:

How would you write 4n + 3 as a verbal expression?

(you can discuss out loud with someone next to you)

Now try this one:

Can you write the following in algebraic form?

“3 less than a number cubed is the same as five”

Which ones are correct for

2m – 7: Twice a

number less than seven

Seven decreased by twice a number

Seven less than twice a number

Twice a number decreased by seven

3m² + 2 = 14 would be written: Two more than 3

times a number squared is fourteen

Three m’s squared plus two equals fourteen

Three times a number squared increased by two is the same as fourteen

Your Homework:

Homework: TextbookReview: P81-84 Do: p. 85 -87: 50, 51, 54, 75