Prealgebra Basic Equations

What is the variable in this expression? 3x=21

• 3

• x

• 21

What equation is represented in this tape diagram?

• x+3=9

• 9x=3

• 3x=9

• 9+3=x

Which equation is represented in this tape diagram?

• x+5=35

• 35x=5

• 5x=35

• 35-x=x

Select all equations that match this tape diagram.

Select all equations that match this tape diagram.

Select all equations that match this balanced hanger.

Select all equations that match this balanced hanger.

Select all equations that match this tape diagram.

Select all equations that match this balanced hanger.

What is the coefficient in this expression? 3x=21

• 3

• x

• 21