Unit 2: Expressions and Equations

Vocabulary

100

This type of math problem has no equal sign.

Expression

200

This type of math problem has an equal sign.

Equation

300

Another word for numbers used in expressions and equations

Constant

400

Another word for the letters used in expressions and equations.

Variable

500

Another word for the number attached (right before) to a variable

Coefficient

Variables on One Side

100

2x + 1 = 5

x=2

200

x/3 - 4 = 11

x=45

300

-2x - 5 = 11

x=-8

400

5(3 - x) = 30

x=-3

500

14x + 2(x - 5) - 10 = -4

x=1

Variables on Both Sides

100

3x + 2 = x + 10

x = 4

200

5x - 3 = 2x + 9

x = 4

300

2(3x - 1) = 4x + 4

x = 3

400

-3(x - 2) + 4x = 2x + 10

x = -4

500

2(3x + 4) + 5 = 3(x + 6) + x

x = 2.5

Distribution

100

Simplify:

3(x+2)

3x + 6

200

Simplify

-4 (m + 9)

-4m - 36

300

Simplify :

- (x + 5)

-x - 5

400

Simplify :

-7(-2x - 3)

14x + 21

500

Simplify :

-5(-2x + 2)

10x - 10

Combining Like Terms

100

Simplify :

x + 2x

3x

200

Simplify:

3x - 9x

-6x

300

Simplify:

10x + 7 -4x + 15

6x + 22

400

Simplify:

9 + 7x - 11 - 12x

-5x - 2

500

Simplify :

-x + 5 + 3x - 7 - 5x

-3x - 2