Two-Step Equations

To undo an operation, you must do its opposite or inverse to both sides of the equation. Match each operation to its inverse.

• Addition

• Subtraction

• Multiplication

• Multiplication

• Division

• Division

• Subtraction

• Addition

Tags

7.11.B

What is the FIRST step in solving this equation?

• subtract 3 from each side

• add three to each side

• subtract 2 from each side

• add 2 to each side

Tags

7.11.B

• add 30 to both sides

• subtract 30 from both sides

• multiply both sides by 30

• divide both sides by 30

Solve for a

• a= -2

• a= -6

• a= 3

• a= 15

WRITE AN EQUATION
You bought a $5 magazine and four
erasers. You spent a total of $25. How
much did each eraser cost?

• 5+x=25
• 5+4x=25
• 5x=25
• 23-5=4x

What does isolate the variable mean?

• Make sure the variable is not alone.
• Get the variable by itself.
• Make the variable do a dance.
• Double the variable

Solve.  -9x - 12 = 33

• 45
• -5
• 5
• -9