8th Grade Equations Review

One-Step

100

x+6=9

X=3

200

m-2= -19

m= -17

300

-2x=32

x= -16

400

h/4=-3

h= -12

500

2/3 x= -20

x=-30

Two-Step

100

3b+4=19

b=5

200

-5y+7= -23

y=6

300

The solution when you solve the equation

-25 + 4(2x + 5) = -61.

What is x = - 7 ?

400

4(x-6)= -16

X=2

500

4/5 m +2= -6

m=-10

Variables on both sides

100

2x+5= 3x

x=5

200

5x+2= 3x-8

x=-5

300

12x+8= 3x+62

x=6

400

16-4x=7x+5

x=1

500

The solution when you solve the equation

6x - 21 = 33 + 9x.

What is x = - 18 ?

Multi-Step Equations

100

7(x-2)=6x

x=14

200

-(a-12)+4a= 9a

a=2

300

3(x+1)=x+5

x=1

400

The solution when you solve the equation

12(x + 3) - 3x = 117.

What is x = 9 ?

500

4(2a+3)= -3(a-1)+31

a=2

Vocabulary

100

In an expression, the parts being added together or subtracted. Example: 4x + 3x + 3y + 7y

What is a term?

200

Terms that contain the same variable(s) raised to the same exponent. These terms can be combined. Example: 3x + 9x or 7y + 3Y

What are like terms?

300

A mathematical phrase that contains numbers, operations, and/or variables (but no = sign). Example: 5x + 4y + 5 - 2x

What is an expression?

400

To perform all indicated operations, including combining like terms. When you do this you do not always get a number answer like 25 or 10 or -1. Frequently you get an expression as an answer, like 2x + 5.

What is simplify?

500

A symbol, usually a letter of the alphabet, used to represent a quantity that can change.

What is a variable?