Solving One-Step Equations

Word List

variabletermexpressioncoefficientequationalgebra

Types of Equations

Addition x + 5 = 15

Subtraction n – 3 = 7

Multiplication 2x = 14

Division n = 65

Inverse Operations

To solve equations we use inverse operations.

Operation Inverse

Addition Subtraction

Subtraction Addition

Multiplication Division

Division Multiplication

Solving addition equations

x + 3 = 9 What type of equation is this?

What inverse operation

should you use?

x + 3 = 9- -3= 3

Subtract 3 from both

sides of the

equation

x = 6

Solving subtraction equations

x - 8 = 12 What type of equation is this?

What inverse operation

should you use?

x - 8 = 12 + 8 =

+8

Add 8 to both

sides of the

equation

x = 20

Practice Problems

1) m – 4 = 92) 12 = s – 33) x – 7 = 214) 15 = r - 5

Model magic

Solving equationsIs all aboutBALANCE

x +++

+++++

++

x =

x++

+++

+

++

x =

USE EACH KEY TO WRITE THE EQUATION REPRESENTED BY EACH PICTURE. THEN, SOLVE EACH EQUATION

What equation is modeled?

= x

=1

Example:

= x

=1

= x

=1

= x

=1

= x

=1

Four in a Row

FIND THE EQUATION BEING MODELED

= x

= 1

Key

= x

= 1

Key

= x

= 1

Key