Evaluate Expressions with Substitution 1

Evaluate Expressions

Desmos

Calculator

Desmos calculator allows

you to type the problem in

and has more tools then

I can use substitution to
evaluate expressions.

Vocabulary

​A variable, like x, is a letter or symbol used to represent an unknown amount.

​

An expression, like x + 2, is a combination of variables, numbers, and at least one operation. ​

Multiple Choice

In the expression 5 - w

the operation is

• 5

• -

• w

Multiple Choice

In the expression 5 - w

the variable is

• 5

• -

• w

Multiple Choice

In the expression 5 - w

the number is

• 5

• -

• w

Evaluating Expressions Example

Example: x + 1 when x = 2

​

Replace the variable, x, with 2.

Your new problem turns into 2 + 1 which equals 3.​

Evaluating Expressions Example

Example: w - 3 when w = 5

​

Replace the variable, w, with 5. Y

our new problem turns into 5 - 3 which equals 2.

Multiple Choice

Solve if a=4

4 + a

• 4

• 0

• 8

• 16

Multiple Choice

Solve if a=4

a x 7

• 3

• 11

• 2

• 28

Multiple Choice

Solve if a=4

a x a - 10

• 2

• 6

• 9

• 5

Fill in the Blank

Solve if b = 9

b + 30 / 6

Fill in the Blank

Solve if b = 9

(b-3) x 4

Fill in the Blank

Solve if b = 9

11 + b - 3

Fill in the Blank

Solve if a = 7 and b = 3

(a x b) - 15

Fill in the Blank

Solve if a = 7 and b = 3

(a + 23) / b

Poll

How do you feel about evaluating expressions?

• I got it!

• I think I understand...

• I need more help.

• I have no idea what to do

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