Linear Equations 2A

Linear Equations 2A

Miss Trang

2A: Algebraic Expressions

Learning Goal

• To review algebraic vocabulary

• To write algebraic expressions from word descriptions

• To evaluate expressions by substituting values

'Term'

A term is a combination of numbers and variables connected with only multiplication and division.

Terms are separated with the operations + and −.

Multiple Choice

How many terms are in the following expression?

• 1

• 2

• 3

• 4

Fill in the Blanks

How many terms are in the following expression?

(type one number only)

Coefficient

Coefficients are the numbers being multiplied by pronumerals.

Multiple Choice

What is the coefficient of c ?

• 1

• 2

• -2

• 4

• 7/6

Multiple Choice

What is the coefficient of b ?

• 1

• 0

• -2

• 4

• 7/6

Multiple Choice

What is the coefficient of a?

• 7

• -7

• 7/6

• -7/6

• 4

Constant term

Constant terms consist of a number only.

It is not multiplied or divided by a variable

Fill in the Blanks

What is the constant term in this expression?

(write your answer as one number)

Fill in the Blanks

What is the constant term in this expression?

(write your answer as one number, no spaces)

Converting word descriptions to algebraic expressions

Maths Key Words

Open Ended

List one key word used for 'addition'.

Note: Try not to repeat someone else's answer!

Open Ended

List one key word used for 'subtraction'.

Note: Try not to repeat someone else's answer!

Open Ended

List one key word used for 'multiplication'.

Note: Try not to repeat someone else's answer!

Open Ended

List one key word used for 'division'.

Note: Try not to repeat someone else's answer!

Fill in the Blanks

Write an algebraic expression for:

Eight more than a number. Let the unknown number be x.

Note: write your expression with no spaces, no capital letters

Fill in the Blanks

Write an algebraic expression for:

A number is subtracted from ten. Let x be the unknown number

Note: write your expression with no spaces, no capital letters

Fill in the Blanks

Write an algebraic expression for:

24 decreased by the product of 6 and q

Note: write your expression with no spaces, no capital letters

Fill in the Blanks

Write an algebraic expression for:

Drew is n years younger than George who is 9 years old. Drew's age is...

Note: write your expression with no spaces, no capital letters

Evaluating expressions

By substituting values

Fill in the Blanks

Evaluate the expression when x=2 and y=4

Note: Answer should be one number. No spaces.

Fill in the Blanks

Evaluate the expression when x=2 and y=-4

Note: Answer should be one number. No spaces.

Fill in the Blanks

Evaluate the expression when x=2 and y=-4

Note: Answer should be one number. No spaces.

Fill in the Blanks

Evaluate the expression when a=2 and b=-4

Note: Answer should be one number. No spaces.

Textbook Questions

Exercise 2A

Q1-6

Extension: Q9