Unit 2 Expressions and Equations

Expressions and Equations

100

The product of a number and x 

7x

200

7 increased by a number

7 + x

300

15 less than a number is 9 

x -15 = 9

400

the quotient of 4 and a number, decreased by 10  

4/x  - 10

500

The taxi driver charges a flat rate of $5.00 and then .50 per mile 

$5.00 + $0.50m

Distributing

100

9 (x - 6)  

9x - 54

200

8 (x - 2) 

8x -16

300

5(x - 4) 

5x-20

400

4(x + 8) 

4x + 32

500

2 (2x + 6) 

4x + 6

Inverse Operations

100

the inverse of addition 

subtraction 

200

the inverse of multiplication

division

300

the inverse of subtraction

addition 

400

The inverse of division

multiplication

500

the inverse of a square 

square root 

One Step Equations

100

x + 5 = 20 

x = 15

200

x - 6 = 7 

x = 13

300

6x = 42

x = 7

400

x/9 = 3

x = 27

500

-8 + x = 8

x = 16

Multistep Equations

100

x/4 - 9 = 2

x = 44

200

2x - 10 = 20 

x = 15

300

3x + 7 + 5x = 23

x = 6

400

7x + 5x - 10 = 50 

x = 12

500

1/2 (x + 8) = 10

x = 12