Equations Review

Vocabulary

100

Value for the variable that makes the equation true

Solution

200

Number that multiplies a variable

Coefficient 

300

Uses an equal sign to show that two expression are equal 

Equation

400

Operations that undo each other

Inverse Operations

500

Letter or symbol that represents an unknown value

Variable 

Properties

100

x-3=15

x-3+4=15+4

Addition Property of Equality 

200

x+7=17

x+7-3=17-3

Subtraction Property of Equality 

300

19+x=23

(19+x)*5=23*5

Multiplication Property of Equality 

400

12=3x

12÷3=3x÷3

Division Property of Equality 

500

15=x÷5

15*5=x÷5*5

Multiplication Property of Equality 

Equations 1

100

26=8+v

v=18

200

10n=40

n=4

300

x-7=13

x=20

400

2/3x=8

12

500

A bakery makes, c, cakes in the morning and sells 56 during breakfast. After breakfast, there are 23 cakes left for lunch. How many cakes did the bakery make? 

79

Equations 2

100

p-3.65=18.5

p=22.15

200

21=7n

n=3

300

v/7=8

56

400

n+1.6=9

n=7.4

500

Eve spends $30 a month on her gym membership. If she has $480 in her bank account, how many months, m, will she be able to pay for her membership?

16

Equations 3

100

2 1/2+x=4 1/8

x=1 5/8

200

5=a/18

a=90

300

5/8x=4 2/3

7 7/15

400

17=x-15

x=32

500

x/5=3 2/3

x=18 1/3