Expressions and Equations

Vocabulary

100

What do equations have that expressions do not have?

=

200

What three things make up a variable expression?

Numbers

Variable(s)

Operations

300

Which step comes first when SOLVING equations?

Undo addition or subtraction OR

Undo multiplication or division

Undo addition or subtraction

400

What is a solution to an equation?

The number for the variable that makes the equation true.

500

How do you "evaluate" an expression?

Substitute the number for the variable then use order of operations to solve.

Solve One-Step Equations

100

x + 5 = 12

x = 7

200

x - 4 = 10

x = 14

300

x / 3 = 12

x = 36

400

x - 11 = 35

x = 46

500

3x = 21

x = 7

Solve Two-Step Equations

100

4x + 2 = 34 

X=8

200

3x - 1 = 11

X= 4

300

x/5 + 2 = 27

x= 125

400

12 + 5x = 57

x= 9

500

2x + 1 +5 = 16

x= 10

Evaluate Expressions

100

x= 5

2x = _____

10

200

x= 3

5x -2 = ______

13

300

x= 4

2x +4x = _______

20

400

x= 3   y= 2

3x - 2y = _______

5

500

x= 4      y= 1

2x + 7y - 2 = ______

13

Simplify Expressions

100

Simplify: 2z + 4z

6z

200

Simplify: 3x + 2 - 2x

x + 2

300

Simplify: 3x + 4 - 2 + 6x

9x + 2

400

Simplify: 5n + 3 + n + 7

6n + 10

500

Simplify: 3(4x - 2) + 5

12x - 1