In the equation
x + 7 = 12
7 is being added to the variable, x. How should you show your work to isolate the variable and solve the equation? 

• Subtract 7 from both sides. The solution is x = 5.
• Add 7 to both sides.
  The solution is x = 19.
• Multiply both sides by 7 The solution is x = 84.

The variable, k, is being divided by 11. How should you show your work to isolate the variable?

• Divide both sides by 11
• Multiply both sides by 11.
• Add 11 to both sides.
• Subtract 11 to both sides.

What is the inverse operation of division?

• Division
• Multiplication
• Addition
• Subtraction

What what is the inverse operation of subtraction?

• addition
• subtraction
• multiplication
• division

r + 20 = 27

• r = 7
• r = 47
• r = 13
• r = 20

-6x = 30

• x = - 5

• x = 24

• x = 5

• x = 36

-3x = -9

• 3

• -3

• 9

• -1

• 100

• 120

• 4

• 5

• -20

• 20

• -5

• 5